I use GimmeSomeTune to provide hotkeys and some other goodies for iTunes. It works alright, but is veeeery crashy — usually every dozen hours or so on my machine.
How to fix that? Let’s relaunch it as soon as it crashes. Simple!
In a terminal:
for (( ; ; )); do open -W /Applications/Multimedia/GimmeSomeTune.app/; done
open is the bash command to launch applications on OS X. It works with all kinds of files: open somefile.avi will open that file in your default video player, VLC for example. The -W flag tells open to wait until the application exits before returning any value. By putting it all in a for loop, we effectively ensure that bash will launch GimmeSomeTune, wait until it crashes, then relaunch it, and so on.
Edit: this is a bad way of doing things. A better way is described here.