The Windows 7 Beta is out now, only via torrents though.

Some valuable information for those downloading the file:

File: 7000.0.081212-1400_client_en-us_Ultimate-GB1CULFRE_EN_DVD.iso
Size: 2618793984 bytes
MD5: f9dce6ebd0a63930b44d8ae802b63825
SHA1: 6071184282B2156FF61CDC5260545C078CCA31EE
CRC32: AABA5A48

That should make sure you get the "genuine" article.

Here is a torrent link matching those details:
http://www.mininova.org/tor/2123650