You know the Three R's of Recycling, don't you?
Reuse old code, art, sprites and character animation
Reduce originality and new ideas
Recycle old games for a new, younger market
Anyway, Capcom, king of Recyclers (although Konami and Nintendo have a shot at the throne with their recent announcements) celebrates 15 years of Street Fighter. They've opened a new web page here (Japanese only):
http://www.capcom.co.jp/sf15th/
P.S. I still love Capcom