I think the bugs will have been largely worked out due to:
1. 6 months of testing Chrome OS on the CR48
2. Release of Chrome 11 on the two laptops from Samsung and Acer based on 12 beta tests of Chromium--ie Chrome 11 is the stable version of the latest Chromium test. And Google adds new features each time there is a Chromium test--voice activation, etc etc
It isn't like it is as new as windows was to dos. It is on a mature kernel. Your risks are hardware-side IMHO. I do kind of wonder if someone will make an amd e-series processor version - the onboard graphics and video decoder of that are essentially a radeon 6000. My next machine WILL play fullscreen hulu at 1080p, gdi. Or maybe not.
I say get it now. We as the consumer have to love and trust the products we love. Only with demand will they keep getting bigger and better. If we want to help make the Google Chromebook the best it can be, and to be a part of the technology revolution we should all get it now.
Why wait? They already did a whole beta test with the CR-48. Thanks to that there have already been a ton of bugs worked out. I WANT to be a part of helping make this successful. If you are one of the first owners you will get a voice in its development.