What are you using to keep them always up and running?

I've used djb's daemontools some 6 years ago, and it was okay back then, but I wonder what is being used by those setting up their gear now. I've also compiled this quick list of players in this space after some googling and asking around:

  * monit http://mmonit.com/monit/
  * supervisord http://supervisord.org/
  * daemonize http://bmc.github.com/daemonize/
  * runit http://smarden.sunsite.dk/runit/
  * perp http://b0llix.net/perp/
  * launchd http://launchd.macosforge.org/
  * DJB's daemontools http://cr.yp.to/daemontools.html

Thank you!