Microsoft still isn’t commenting on when a beta of Service Pack 1 for Vista will be officially released, but the company has posted two updates that are expected to be part of that final package: the “performance and reliability” update and the “compatibility and reliability” update. These are official releases.
Among other things the Explorer file transfer slowness has been fixed as has hibernate/sleep (well, for some laptops), and a load of video card support issues have been sorted (I will try these on my Dell D810 and let you know).
See KB 938979 (memory performance) and KB 938194 (the one which *finally* lets you play games 😉 )
While this isn’t beta software, you would be advised to read both KB entries and hitting the discussion thread before installing the updates just to see what to expect and what your fellow Vista users are experiencing… and I will install both and let you know ASP.