FriendFeed helps keep track of friends’ contributions to a myriad of sites (e.g., additions to their blogs, Flickr and del.icio.us accounts, Twitter, etc.). I’m wondering about additional friends who may use it since currently I only have two on the service.
Several things are far from intuitive, but for now I’ve figured out everything I was looking for even if not as easily as one would hope. (Look for the feed of the feed aggregation under “Settings” and then the “secret key” tab. If you want to turn off notification about the feeds of your friends’ friends then click on “Hide entries like this”, which will give you an option to specify removing material from those people.)