I just received 16 invites for Google Wave, and I am gonna give them to who is interested. 
To get one, just write your email in this comment, I will invite you and the filter your email, for privacy reasons 
Google Wave it's a sort of Facebook clone, for now it's a little bit useless, but with more users it will become very interesting. Wanna have a try? 
edit January 8, 2010: invites still available!