Almost overnight, Friendfeed is becoming a rather 'large house' with a lot of rooms!
Google has indexed over 100 rooms.
The 'room' feature (somewhat reminiscent of the IRC and chat room days), was just introduced by Friendfeed in the past few days.
Some of the public rooms include numerous individuals, topics, special interests, search (sem), blogging, FAQ's, advice, tips, weather and more.
Anyone can create their own room (and decorate it accordingly :)
Update: Google Blogoscoped has posted a Friendfeed room listing with over 500 entries here.