So many people are talking about the Google Wave. It is still beta and Google limited the amount of users who may have access. You can either fill out a form and wait for an approval or get invited by someone else who still has invites left.
Since I got an invite (special thanks to Leuk and Jack Brendon Smoke) I really like it. Sometimes it is quite slow and some things are not working fully, but hey, it is beta and Google stated it.
The Wave is a powerful tool which I think will be a future kind of team collaboration. You can see in realtime what the other participants are typing or changing. A playback function shows you all changes step by step.
Many public Waves are available, where everybody can join and take part. Also, you can make your Waves public by inviting a special email address.
There are a lot of things to do until it matches a fluently workflow, but even in this state it is quite useful.
If you want to join, I am still having some invites left. Just leave a comment below with your email you want the invite to be sent to.

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Invitation came. Thank you. In the mean time there was another invitation subjected “Your invitation to preview Google Wave”. Was it from you, too?
I sent it out only once. Maybe you filled out the the request form earlier?
I put my email as you stated on Twitter. =) Thanks.
Just Sent out. Now wait for Google sending you the invitation URL.
I can haz invite please?
Sent out. Now wait for Google sending you the invitation URL.