Followed users is an English Wikipedia tool on Toolserver that allows you to keep a list of users that you follow, similar to a watchlist, and lists the most recent edit by each user. The idea was conceived by User:Quintucket. It requires you to log in with a TUSC account before you can use it (you can easily sign up for one if you don't have one).
This has many uses, such as keeping an eye on warned users, collaborating with users in a team, mentoring, following students in a class, or just for learning from the edits of others. All followed user lists are public.
This optional Javascript extension adds "Follow user"/"Unfollow user" options to your toolbox on user/user talk pages and a link to Followed users to the upper-right. To use it, edit your common.js and add "importScript("User:Dcoetzee/Followed_users.js");" to the end.