According to Microsoft, they are "adding more servers to handle the demand." But here's the direct link to the iso (from Microsoft's own servers, not bittorrent!)
The version is build 7000.0.081212Windows 7 Beta (x86) : 7000.0.081212-1400_client_en-us_Ultimate-GB1CULXFRE_EN_DVD.ISO
Windows 7 Beta (x64) : 7000.0.081212-1400_client_en-us_Ultimate-GB1CULXFRE_EN_DVD.ISO
UPDATE: Get your Windows 7 Beta Key here. If you don't have a key, your Windows 7 will only get to see the light on it's day for 90 days only.
Josh's Verdict: Works pretty ok for me.. Update: I finished downloading this file. Works perfectly.
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