I'm using Chrome OS Everbody! Well, technically Chromium OS Zero, and I've got it up and running on my eeepc 900. ***! It just broke when I tried to install flash. oops!
I'm back on karmic now but chromium os zero is brilliant! It's not as good as chrome os is going to be later this year(I'm estimating from Google's info), but it works! I had to tweak it a bit(and will have to again), but when I had it was brilliant. It's got the Ubuntu terminal so I am familiar with it.
If you like experimenting with operating systems, then try this out now! It's really fun to tweak and use!
Here is my chromium zero adventure(I haven't finished yet though!).