We had an apache process that wasn't restarting cleanly and kept waking us up in the middle of the night to restart. Having heard about monit at Atlanta Startup Weekend, I decided to give it a try.
I was able to download, compile, install, setup, and test monit in about 15 minutes.
Docs are great, the configuration DSL is easy and powerful, and I am very impressed so far.
I see monit making me sleep better at night already...