[mceachen]

We use Delayed Job at AdGrok for both for async jobs kicked off from user activity as well as nightly maintenance jobs.

If you need support for "job prerequisites", (one job to not start before other jobs have finished successfully), we'll be adding that to our fork from collectiveidea soon. The DJ codebase is pretty nice to look at, too. Note also that there are capistrano dj deployment recipes in the git source.