I've been playing around with Google Wave, and received a couple of extra invites to the free beta. If you are interested, let me know and I'll send one your way.
My short review: It looks like one of those tools where it takes a lot of work to gain any benefit from it. That being said, if you are collaborating with a lot of people on several different projects it has real potential.
I'm an independent security researcher, and for once I'm using that term to mean something besides being unemployed. I recently graduated with a PhD in Computer Science from Florida State University and my dissertation focused on developing new password cracking techniques for law enforcement officials. Despite that I do like to branch out a bit and am a network security engineer at heart. I'm also a huge fan of data driven research. I realize that doesn't mean much, (it's like saying you love puppies rainbows), but it's my way of warning you that I hate making a point unless I have at least two excel graphs backing me up, (and yes I'm lame for not using GNUPlot).