So first off, FriendFeed is a great service and kudos to all those that have worked hard on it. I’ve been using the service for a little while now and I’ve come to believe there are three features that it really needs to make it into a much more powerful app.
1) Personal Ranking of Users and Content Type
Facebook already has this. When you get your news feed of your friends activity, you can signal a thumbs up (or the equivalent of a thumbs down) and Facebook learns what type of friend activity you are actually interested in. FriendFeed should give you the ability to do this both on a user level (i.e. friends you care about more than others) and on a friend service or content type level (e.g. I like their tweets but not their flickr photos). When it learns what you like, FriendFeed should show those items more often and respectively other items less often or never.
