Cydia PwnageTool
Cydia, the package manager for jailbreak apps, is the very model of a major modern manager. It's slick and quick, and it installs apps and updates faster than Apple's App Store. You do need to jailbreak your iPhone to use Cydia or any of the unofficial iPhone apps, but this is where it all starts. Free download and jailbreak instructions at
blog.iphone-dev.org.
