Pusher is a tool that installs world-famous Installer.app that gives access to numerous award-winning tools for the iPhone and allows you to use best of both App Store and Installer without compromising your security. Download for Mac OS X or Windows (coming really soon). Pusher will put Installer.app onto your 2.0.2, 2.1, 2.2 or 2.2.1 iPhone (both 2G and 3G) as well as a number of other goodies.