Lingon

In this post, I mentioned Launchd Editor.  This was not the ideal tool for me, as once you created the plist file, you had to manually install it.  It looks like Lingon solves this problem.

Lingon gives you a graphical interface to create the launchd plist files, and will install them for you.  Another interesting feature is the wizard, which walks you through the steps to create the launchd files.  This is what Apple should have done when initially when they first shipped launchd.