This list does not only consist of reliable sources but also of other background information. Further sorting and help of archive.org required.
http://news.cnet.com/2100-1026_3-6072032.html
http://news.cnet.com/8301-17939_109-9730479-2.html
http://www.gamasutra.com/view/news/105638/WIM_Q__A_Doppelgangers_Tim_Stevens_Talks_vSide.php
http://www.gamasutra.com/view/news/14966/Worlds_in_Motion_Preview_Doppelgangers_vSide.php
http://web.archive.org/web/20070909153030/http://www.worldsinmotion.biz/2007/07/q_a_doppelgangers_tim_stevens.php
http://web.archive.org/web/20070830094007/http://www.worldsinmotion.biz/2007/08/worlds_in_motion_preview_doppe.php
http://web.archive.org/web/20071012122919/http://www.worldsinmotion.biz/2007/08/doppelganger_gains_11_million.php
http://web.archive.org/web/20090714115258/http://www.worldsinmotion.biz/2009/07/doppelganger_closing_vside_due.php
http://www.wired.com/listening_post/2007/07/the-idea-behind/
http://www.wired.com/listening_post/2007/08/doppelganger-to/
http://www.gamesetwatch.com/2006/05/pussycat_dolls_virtual_lounge.php (minor mention)
http://www.gamesetwatch.com/2008/01/worlds_collide_a_worlds_in_mot.php
http://www.gamesetwatch.com/2006/05/pussycat_dolls_virtual_lounge.php
AP: http://connection.ebscohost.com/c/articles/24526270/tyra-gets-virtual-hangout - Google Books - Online - Full text
AP: http://connection.ebscohost.com/c/articles/25379719/ovitz-getting-board-doppelganger-world - Full text
AP: http://books.google.de/books?id=aMEqAQAAIAAJ&q=Doppelganger - online
Press Releases
edithttp://www.thefreelibrary.com/Doppelganger+Builds+on+Strong+Momentum+To+Evolve+Next+Generation...-a0167551894
http://www.thefreelibrary.com/Ready+to+Meet+Your+Virtual+Doppelganger%3f+The+Gang's+All+Here.-a0145777413
http://www.thefreelibrary.com/Doppelganger+Appoints+New+CEO.-a0159278551
http://www.thefreelibrary.com/Doppelganger+and+Telepictures+Productions+Launch+'The+Tyra+Banks...-a0159480898
http://www.thefreelibrary.com/Doppelganger+Signs+Top+Talent+to+Extended+Deals+for+Collaboratively...-a0162105366
http://www.thefreelibrary.com/Doppelganger+Selected+by+AlwaysOn+as+an+OnHollywood+100+Top+Private...-a0162778652
http://www.thefreelibrary.com/Doppelganger+Partners+With+Top+Fashion+Brands+to+Offer+Virtual+Retail...-a0164800223
http://www.thefreelibrary.com/Doppelganger+Raises+%2411+Million+in+New+Funding+for+Immersive+Social...-a0167551893
http://www.thefreelibrary.com/Doppelganger+and+Interscope+Bring+Hot+New+Artists,+Music+and+Events...-a0163793030
http://www.prnewswire.com/news-releases/doppelganger-partners-with-top-fashion-brands-to-offer-virtual-retail-experience-58013117.html
http://www.prnewswire.com/news-releases/doppelganger-signs-top-talent-to-extended-deals-for-collaboratively-programmed-online-entertainment-58344272.html
http://www.prnewswire.com/news-releases/ready-to-meet-your-virtual-doppelganger-the-gangs-all-here-56342112.html
http://www.prweb.com/releases/virtual_worlds/social_entertainment/prweb827434.htm
http://www.mcvuk.com/index.php/press-releases/read/double-fusion-and-doppelganger-to-integrate-brands-into-3d-social-entertainment-virtual-world-for-teens-vside/062937
http://web.archive.org/web/20080512234403/http://www.doppelganger.com/Doppelganger.pdf
http://web.archive.org/web/20080508175520/forums.vside.com/forums/thread.jspa?threadID=17728&tstart=0
http://web.archive.org/web/20090923144908/http://forums.vside.com/forums/ann.jspa?annID=545
Personal Blogs
edithttp://planniffication.blogspot.com/2007/08/vside-is-live.html
http://rock-vacirca.blogspot.com/2010/03/ups-and-downs-of-vside.html
http://www.calebbooker.com/blog/2007/08/14/vside-is-cool-but-they-tricked-me/
http://dusanwriter.wordpress.com/2008/04/09/degrassi-gang-gets-vside-launch/
http://www.garagegames.com/community/blogs/view/17615
http://www.garagegames.com/community/blogs/view/17365
http://www.garagegames.com/community/blogs/view/15190
http://www.garagegames.com/community/blogs/view/13398
http://www.garagegames.com/community/blogs/view/12375
Other Sources
edithttp://web.archive.org/web/20071019055849/http://www.redherring.com/Home/22546
http://gigaom.com/2006/05/15/doppelganger-a-new-online-ad-model/
http://mashable.com/2007/08/13/doppelganger-funded/
http://web.archive.org/web/20110820175701/http://masondt1.webs.com/apps/blog/show/1651522-running-the-numbers-vside-
http://money.cnn.com/2006/05/15/technology/business2_launchpad0515/index.htm
http://web.archive.org/web/20080502181428/http://www.virtualworldsnews.com/2007/08/doppelganger-vs.html
http://web.archive.org/web/20080516214615/http://www.virtualworldsnews.com/2007/11/voy-plaza-launc.html
http://web.archive.org/web/20081227102905/http://www.virtualworldsnews.com/2007/07/doppelganger-us.html
http://web.archive.org/web/20081227134641/http://www.virtualworldsnews.com/2007/07/doppelganger-to.html
http://web.archive.org/web/20081227134933/http://www.virtualworldsnews.com/2007/08/doppelganger-an.html
http://web.archive.org/web/20081227135020/http://www.virtualworldsnews.com/2008/04/doppelganger-la.html
http://web.archive.org/web/20090315010434/http://www.virtualworldsnews.com/2007/08/interview-tim-s.html
http://web.archive.org/web/20090408072326/http://www.virtualworldsnews.com/2007/06/doppelganger_pa.html
http://web.archive.org/web/20100817014134/http://www.virtualworldsnews.com/2009/07/vside-assets-sold-to-exitreality.html
http://web.archive.org/web/20091001195653/http://www.virtualworldsnews.com/2009/07/vside-acquired-by-exitreality.html
http://valleywag.gawker.com/tech/virtual-worlds/second-life-gains-a-fast-follower-286869.php
http://venturebeat.com/2007/02/01/roundup-doppelganger-targets-secondlife-draper-bankrolls-sex-toys-more/
http://venturebeat.com/2007/08/14/doppelganger-launches-its-musical-virtual-world-vside/
http://web.archive.org/web/20071111044819/http://metaversed.com/22-aug-2007/15-things-you-should-know-about-vside-new-3d-facebook
http://www.bizjournals.com/sanfrancisco/stories/2007/08/20/story11.html
http://www.businessweek.com/technology/content/may2006/tc20060515_945235.htm
http://www.ctv.ca/mini/degrassi2006/static/vside.html
http://www.engagedigital.com/2007/07/doppelganger-us.html
http://www.engagedigital.com/2009/07/30/vside-assets-sold-to-exitreality/
http://www.guardian.co.uk/technology/2008/apr/10/games.news
http://www.informationweek.com/news/internet/ebusiness/showArticle.jhtml?articleID=201001856
http://www.kzero.co.uk/?s=vside (contact KZero for respective reports?)
http://www.kzero.co.uk/blog/?p=2156
http://www.mediacastermagazine.com/news/3-d-degrassi-launches-in-virtual-world/1000080150/?issue=06122008
http://www.pehub.com/2007/08/14/doppelganger-scores-11-million/
http://www.raphkoster.com/2009/07/09/doppelganger-shutters-vside/
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2006/05/15/BUG0VIR49B1.DTL
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/08/14/BUPVRHSIQ.DTL
http://blog.sfgate.com/techchron/2007/08/13/11-million-in-funding-for-doppelganger/
http://www.sys-con.com/node/534732
http://www.thealarmclock.com/mt/archives/2007/08/musical_im_avat.html
http://www.throng.ca/node/4777
http://xorsyst.com/anime/funimation-virtual-anime-festival/
http://www.christinamultimedia.com/forum/index.php/topic,64489.msg1909622.html#msg1909622 - first "Preview" launch on March 3, 2006
http://www.sec.gov/Archives/edgar/vprr/05/9999999997-05-026335
http://www.sec.gov/Archives/edgar/vprr/05/9999999997-05-040164
http://www.sec.gov/Archives/edgar/vprr/05/9999999997-05-050552
http://www.sec.gov/Archives/edgar/vprr/07/9999999997-07-003876
http://www.sec.gov/Archives/edgar/vprr/07/9999999997-07-024264
http://www.sec.gov/Archives/edgar/vprr/07/9999999997-07-037386
http://www.sec.gov/Archives/edgar/vprr/09/9999999997-09-002672
https://delecorp.delaware.gov/tin/controller File № 3941834
http://kepler.sos.ca.gov/ Entity № C2673401
http://kepler.sos.ca.gov/ Entity № C2727071
http://www.highbeam.com/doc/1G1-167909614.html
Search Queries
edithttp://www.google.com/cse/home?cx=003516479746865699832:leawcwkqifq (to-do: "vSide", "The Music Lounge", "PCD Lounge", "Doppelganger", "Evil Twin Studios")
http://www.google.com/cse/home?cx=003516479746865699832:qdq1uk9p1ua (to-do)
http://www.google.com/cse/home?cx=009782238053898643791:8naerdbd-oy (to-do)
http://statsbiblioteket.dk/videnskabeligeartikler/index.jsp?query=vSide&keepFilter=false&first_search=true
http://scholar.google.com/scholar?q=%22vSide%22+%22Doppelganger%22