JailbreakMe

JailbreakMe is a site that has been used multiple times to jailbreak iDevices. It is currently online with the Star Jailbreak by comex.

First Incarnation (AppSnapp)
Initially, Conceited Software utilized the LibTiff exploit with jailbreakme.com, which also went by the name "AppSnapp," to jailbreak iOS 1.1.1. Upon the release of iOS 2.0 and the debut of the App Store, Conceited Software closed JailbreakMe, when it remained dormant for a while.

Second Incarnation (Star)
comex has since repurposed the domain for Star, his userland jailbreak for iOS 3.1.2 through 4.0.1. However, comex stated that the bug used for the untethered jailbreak was there until 4.3 as Apple did not patch the bug correctly. It was properly patched on 4.3.1 in order to prevent the jailbreak of the iPad 2. It's still possible the site could be repurposed to jailbreak iDevices up to 4.3, but this has not yet been done.

Third Incarnation (Saffron)
In June 2011, comex began to put up teasers on JailbreakMe. In early July 2011, someone Googled comex's other site and found a prerelease version of "Saffron," the third incarnation of JailbreakMe. Word about this "leak" inevitably spread. On July 6, 2011, "Saffron" made its official debut on JailbreakMe.

External Link
JailbreakME.com