Redsn0w 0.9.8b1 for Windows to jailbreak iOS 5 beta 1 for iPhone 4, 3GS, iPod touch 4G, 3G and iPad 1 has been released , download links after the break.
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Jailbreak iOS 5 Windows :

Last week dev-team already released redsn0w 0.9.8b1 for Mac. Instruction to use Redsn0w 0.9.8b1 for windows to jailbreak iOS 5 beta 1 are the same as our previous guide [You must be registered and logged in to see this link.]. But please read the entire article carefully as this is a special version which is for developers only.

[You must be registered and logged in to see this link.] Redsn0w 0.9.8 b1 for Windows.
[You must be registered and logged in to see this link.] iOS 5 beta 1 for developers.
[You must be registered and logged in to see this link.] iTunes 10.5

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