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... Windows 7, build 7057, IE 8, which does not say it's a beta anymore ...

Is that IE8 or Windows 7? If W7 then that's because, technically, it ain't. The only official beta version of Windows 7 is the build that MS released - Build 7000 - which is also the only Windows 7 Beta that MS is going to release. Both 7048 and 7057 are leaked versions of the final and, as MS did not plan to release them, they don't carry the Beta tag. 7057 is most likely part of the Release Candidate family.

If IE8, well, it's not a Beta either, seeing as MS released it just over a week ago. I imagine a finalish version was included in W7 Build 7057 so that MS could test it. Just so happens that the wider world got to test it, too.

Edit:

Don't know if you've seen the news about the RC - http://blogs.zdnet.com/microsoft/?p=2369&tag=nl.e539. It expires in June 2010! Hopefully RTM will be around Autumn, and GA in the early part of next year. If so, then we'll still have a few months for the price to drop if no-one can crack it.

Btw, when you install the new Chrome beta, visit: http://www.chromeexperiments.com. It's a collection of JS pages designed for Chrome. Some of them are rather good - there's a bouncing ball one which is fun to spread across monitors, one that bounces balls off lines to make notes, and another notey one that uses the gravity of points and sucks particles in to make drones (you can change the pitch of them).