I got the 32-bit build 7000 to work, but I've downloaded the 64-bit version several times and it's never installed for me (same error about missing files during install.)
They did these 'test updates' during the XP and Vista betas too. You'd think they could release some actual bug fixes and just propogate THOSE out instead of making dummy updates... Maybe build 7000 is completely 100% bug-free?!?! (/sarcasm)
"Recently Tech ARP reported that Microsoft plans to launch the release candidate of Windows 7 in April, followed by the retail (RTM) version sometime before the 2009 holiday season."
That's scary. I just spent a week testing the 64-bit beta and it has a lot of stability and design problems. It's better than Vista but it's more of a buggy service pack for Vista than a new release. The XP to XP SP2 transition was a lot better.