If you know what Google Wave is, and you want to be invited to join in the beta, I have 8 invitations I can give to anyone who wants them. Just leave a comment and your email address (it helps if you have a gmail account.)
If you don’t know what Google Wave is, there is a fairly brief and informative description here: http://www.youtube.com/watch?v=rDu2A3WzQpo. If you want the whole Google Developer Conference introduction to Wave, that’s here, but it’s 80 minutes long.