> This also brings up the question, who would legitamately
> have a copy of the beta and then leak it? A hardware
> vendor, perhaps?
Well, I imagine a lot of IHV's would have a copy. Nvidia, ATI, Creative, and others surely would. Microsoft would probably have a copy for DX/XP/whatever certification. And one of the readme's with the source (um, I heard) mentions IHV's specifically, so chances are tons of people have seen/played it already. I don't doubt that some tester at one of these companies zipped a copy up and took it home.
If I were Nvidia, after Valve has repeatedly bitch slapped me in the media, I might turn a blind eye to a beta being leaked, especially if it's buggy. Of course, if I were Valve, I would watermark each leaked file to verify the source. But then again, Valve has proven to not be so bright.