iOS (Jailbroken): One of the most annoying features of playing music on an iPhone is the fact that when you disconnect and then reconnect your headphones you have to go back and manually restart the music player. Plugication fixes the annoyance by automatically restarting the music player when you connect your headphones back in.
Plugication doesn't do anything else, but it does solve the annoying problem of always having to hit play again when you plug headphones back in. The settings can be toggled for both Play on Connect and Pause on Disconnect in the settings menu. It's a free download in the Cydia Store you can find by searching Plugication in the Modmyi repository.