full story at :http://news.cnet.com/8301-13579_3-20012305-37.html?part=rss&subj=news&tag=2547-1_3-0-20

The unlocked iPhone 4 is now technically legal and technically possible.
Just days after the U.S. Copyright Office ruled that bypassing a manufacturer's protection mechanisms to allow "handsets to execute software applications" no longer violates federal copyright law, the iPhone Dev Team on Sunday released a jailbreak for the iPhone 4 at JailbreakMe.com.