I recently got an invite to trial Google Wave from Google.
I've got 5 invites to give out now, please PM me or reply here if interested. I'll send the invitation direct to the e-mail you registered here with, unless you give another one you'd prefer me to use. First come first served.
What is a wave?A wave is equal parts conversation and document. People can communicate and work together with richly formatted text, photos, videos, maps, and more.
A wave is shared. Any participant can reply anywhere in the message, edit the content and add participants at any point in the process. Then playback lets anyone rewind the wave to see who said what and when.
A wave is live. With live transmission as you type, participants on a wave can have faster conversations, see edits and interact with extensions in real-time.
It's currently very much under-developed and needs to get much wider penetration before Wave actually become useful to more than 0.1% of its current users. That said, some people in the hi-tech industry assure me Google Wave is the next big thing that will displace conventional e-mail and chat, and revolutionize collaborative online work.