I love it, as well. Been using it for a month and a half or more. Seeing if any of my friends are playing whatever game I click on is super handy, and I love the artwork that shows up when you select a game, too.
Also, the Library list contains more than just your games -- it also gives you a list of the videos and tools you downloaded from Steam. The Games list is just what opens by default.
The web browser works pretty nicely, too, but I rarely use it in-game for more than a minute or two at a time, usually just to find a link I want to send to someone.