Ive signed up for it and see that it could be miles better than Facebook if it takes off. Sadly not many Friends on it as not many people seem to have moved over yet so can't get the full potential out of it.
Must have some decent features though as Facebook has already loosley copied some of them
I agree with the lack of friends thing! I wondered if it was just me but it does seem that there aren't that many people using it yet.
I think the biggest advantage of it is that you can have your Piccasa, Docs, social network, mail and search engine all in one place!
I personally love google and all of there products (especially because they are free)
I've had a few people request friends on it but I've not committed to it at all, I'll see what happens with it, I think part of my problem is that i've got a lack of trust with Google, we could be a year down the line and they state they're scrapping it, they've done that a lot, although I appreciate that they also try a lot of stuff as well that does work out.