Just got my invite to google wave. If you want an invite (I've got about 10) leave a message in the comments and I'll get one to you. They apparently don't send immediately so it will take a little while for you to get it. If you don't know what google wave is - their (very long) description of it is here:
This is a pretty exciting technology - google is attempting to replace email with something that actually utilizes the advances we've made in the last 30 years. Email is outdated and sluggish and it would be great if they got some traction moving people away from it. While Wave may not be the technology to replace email - at least someone is taking steps to try something ambitious to advance computing. I like Wave however the technologies to implement it are complex which may hinder adoption. Also, at this time it does NOT integrate with email, this will be required if they ever want to transition corporations from one technology to the other.