The latest version of the iPhone jailbreak/unlock utility PwnageTool is available now, and includes both Cydia and Installer 4 beta. You still can't unlock your iPhone 3G with this, but you can jailbreak it to use apps that aren't purchased from the official iTunes Store. Yeah, you know what to do by now. Go grab it. [iPhone Dev]
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For 2.0, pwnage tool was just for mac, i believe. I imagine it's the same this time round. Guess us windows users will have to wait for winpwn, or get our hands dirty and futz around w/out a neato installer.
... i think i'll wait.