* The people and conversations are great. Facebook is for finding people you know. G+ is for meting people you don't know (and talking to them in threads with more the 140 characters at a time).
* +1's are like the next bookmark. When I find a useful page, I +1 it instead of bookmarking. When I search again, there it is.
* The integration with Android is awesome.
* When people realize how good the photo editor is, it'll take off.
That's what I can think of off the top of my head.
But it could always be better. +Bradley Horowitz
, I'd like to see APIs and pictures in comments (like Fark, but with support for external photos AND G+ photos).