I think I blogged about this site a couple of years ago but they recently improved it and it's worth another mention.  This is the best site I've ever seen for finding a handy list of the multitude of additional Team System add-ons.  I frequently complain to our marketing team asking "Why can't we have a list as good as theirs?" :).  Since we don't, I still recommend Accentient's page as the best game in town.