A little off topic, but one thing I've been unable to determine about Google+ due to the limited number of people on the service is how well I'm going to like how Circles seem to be a cross between the FB friends list and a Twitter following.

In Google+, you can add anyone to a circle without their permission (as opposed to sites like FB and LinkedIn where people have to mutually agree to be friends). So, you can have any number of people following you and, though you can see who they are, you can't do much about it. This really puts the pressure on you to create and use your circles wisely in order to limit who sees what.

I suspect that a lot of people coming over from FB aren't going to understand (or notice this).

I think I like the idea of it. I'm just looking forward to having many more friends to test it out with.