Yesterday I got access to Google Wave Preview. I've tested it a little bit now, but for the moment I have only one other friend that uses it. That makes testing a little bit pointless ;)
I was really excited when I got the invitation, now I have to say that it's not that awesome as it seemed in the presentation. It's nice but still work in progress and you can see that a lot. It seems a little bit buggy to me.
Now to the big question: will it be the new email + im + everything in one?
I guess it will never substitute email as it was originally intended nor will it substitute IM between two persons. I see a big advantage in Google Wave when more than two people are involved in a discussion. Mailing lists are really a pain in the ass to read, so are Skype chat sessions with more than 2 buddies. Google Wave could be very nice even for two people to write wiki-like documents or to brainstorm, but not for a solid conversation.
Google Wave has some potential with the widgets you can use. For now there are not many widgets included (only Map, YesNoMaybe and Sudoku ;)), but that will change in future and there are a lot of people out there with good ideas for widgets.
For now: let's wait and see what comes next and how people accept it!
[EDIT]: Please don't comment on it wanting to get invited, I already used up my invitations.
Bits and pieces about free software and various other things.