µMonitor is little iPhone app that lets you remotely control µTorrent back at your computer. But like Transmission's Drivetrain app, it's been banned by Apple on anti-piracy grounds. Usefully, however: Jailbreakers can still pick it up via Cydia.
It kind of sux that even a monitoring app got banned. But, according to Apple:
…this category of applications is often used for the purpose of infringing third party rights. We have chosen to not publish this type of application to the App Store.
So no torrent apps, at all, period. Right then.