I was extremely excited to receive an invitation to preview Google Wave. I cannot wait to play with it!
It is this awesome new online tool that is just coming out (in beta) that I think will be the “wave” of future online communications, replacing email and IM as we know it.
http://wave.google.com/help/wave/about.html
I watched a demo on it several months ago and signed up in hopes that I would get an “invite” to participate in it before it totally went live, so I am pretty excited to try it out.