Where can I download the public beta of Windows 7 (beta 1)?

The Windows Team Blog will be updated in the next few hours detailing when and where to download the public beta 1 of Windows 7

I've been running the PDC/WinHec build of Windows 7 since October daily as my main machine and it's worked brilliantly.

James Senior's blog has some great links to and descriptions of what's in store with Windows 7: