A little while ago at Orangutan we had a client ask us to export several hundred frames from a 1 hour video we had produced for them.
We worked in fcpx and manually exporting frames can be quite a task.
So I spent a late afternoon putting together a little app to read fcpxml and use it to export still images based on the markers we had put in the timeline.
I polished it a little more and shared it on the fcp.co forums and over the week the little app had been downloaded over 700 times.
It even got a nice review from Larry Jordan and several retweets from other fcpx pros like Richard Taylor and sites like premiumbeat.com.
fcpxImageExporter is available over at Orangutan.