Comex has released his jailbreak for all iOS 4 devices including the iPhone 4! I recently signed up to twitter with the express purpose of following the guys working on the jb and unlock for 4iOS.

At 6:08, twitter message: @comex http://jailbreakme.com/
1.Just navigate to above via your iPhone....took about 5 minutes to load cydia.
2. If you're nervous about doing this, read here for 'instructions': http://thebigboss.org/2010/08/01/off...-jailbreak-out

The unlock to follow in about 48 hours. Twitter message: @MuscleNerd - iPhone4 carrier unlock will be pushed after small test period (only @planetbeing and I have been able to test til now!)

More information here:

http://iclarified.com/entry/index.php?enid=10942
http://modmyi.com/forums/iphone-news...le+Feedfetcher