WinPwn 2.0 Available Now for JailBreak iPhone in Microsoft Windows
Not sure how to jailbreak your iPhone 3G with the PwnageTool 2.0 because you do not have a Mac? WinPwn goes 2.0 now and will let you unlock, jailbreak your iPhone (only support jailbreak for iPhone 3G) with the new firmware 2.0.

Some important notes that you have to read
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Remove Winpwn 1.0 completely if you have it installed. Installing over the top of WinPwn 1.0 will cause problems.
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Make sure you have the latest version of iTunes ( Currently 7.7)
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If you already have service with AT&T do not activate or install Youtube Fix
Check the download link here via [engadgetmobile]