Jailbreak Released for All iOS 4 Devices Including the iPhone 4
 

Comex has released his jailbreak for all iOS 4 devices including the iPhone 4. He tweeted a link to http://www.jailbreakme.com moments ago.

Unfortunately, the servers were immediately slammed and have gone down. We will let you know as soon as they are up. We will also have tutorials on how to use the jailbreak as soon as it can be downloaded.

Once you have jailbreakon your iPhone on iOS 4 you will be able to unlock it using UltraSn0w.

Congratulations to comex and the iPhone Dev-Team for making this happen. and
The userland jailbreak for iPhone 4, iPhone 3GS, 3G on iOS 4 / 4.0.1, iPod touch on iOS 4, and iPad on iOS 3.2.1 is out !!. It is a browser based jailbreak, all you have to do is to browse to http://jailbreakme.com from your iOS device to jailbreak it. Servers are probably thrashed right now. Keep trying until you successfully load the page. We will be back with quick how-to guides soon. Stay tuned for that !!

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