iPhoneAtlas reports that one click web-based Jailbreak for the iPhone and iPod Touch has seen 144,000 downloads since its release. The programmers estimates that this number represents approximately 100,000 actual devices.
AppSnapp allows iPhone and iPod Touch users to "jailbreak" their device easily to allow installation of 3rd party applications. Using the known TIFF exploit, by simply downloading the image on your device's Safari browser triggers the application to open up the iPhone and install the proper applications.