Twitter Favorites from your Friends: You can generate an aggregated feed from all your friends' favorite tweets. You just need to provide your user id as an input . It will fetch all the twitter friends and their favorite tweets. You can also use this to implement a Group-favorites functionality for a user-id acting as Group.
Pipe Web Address: http://pipes.yahoo.com/pipes/pipe.info?_id=5ihLhQk33hGxdGpe0j6skA