I spend a lot of time "feeding the elephant's child" here on Wikipedia, and as I read this and that I make whatever contributions I can, primarily the addition of hyperlinks.
I tend to concentrate on articles about electronics, mathematics, physics and military history, but given my inherently curious nature I'm liable to wander around most anywhere (e.g. the grammar articles are quite robust and fascinating).
I am hoping to spend more time getting the Arkansas geographical articles consistently template based, in the fashion of the Louisiana folks, who have done an outstanding job in that regard.