Hmm...It would be interesting if one could subscribe to a personalized feed of some sort. Currently I skim my github feed in Google Reader every couple days. The biggest problem with it is that I watch RVM, which is fairly high traffic. It would be neat if I could subscribe to, say, only tag pushes on the RVM repo.
http://fmlr.me/
But, sort of got stuck at how to do the client. I've recently relearned GUI coding and will probably dust the idea off and try it again soon.