I'm absolutely in love with the idea of "circles." Although my opinion may sway when I finally get my hands on it, it seems as though there's a lot of value in being able to distribute my personal content to specific groups (granted this is possible on Facebook, but it seems like Google is curing the lazy factor). Can't wait to get my hands on an account and see what it's like. I just hope that their scarcity model doesn't box people out. I wanted wave to work so well but when none of my friends/colleagues could get an invite, it made it, well, pointless.