Dev-Team Blog
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The return of jailbreakme.com! 

jailbreakme.com is back!

Thanks to some serious work by @comex, you can now jailbreak your iPhone, iPod Touch, or iPad right from MobileSafari — no PC or Mac needed!

Just visit http://jailbreakme.com on your device.

For those needing a carrier unlock, use the existing ultrasn0w in Cydia on your iPhone3G or iPhone3GS.  After a short testing period, we’ll push out the iPhone4 version.

Note: The earlier MMS and Facetime issues have been fixed.  If you already ran the version with those problems, launch Cydia and accept its offer to update.