I recently upgraded Transmit using the in-application Update functionality, but after that, whenever I tried emptying the trash, I received a warning that I couldn't delete the "Transmit Favorite Importer," because it was still in use.
Well, the Transmit Favorite Importer ties into the mdworker process on a Mac, which updates the Spotlight search index. Knowing this, I went into Activity Monitor, found the mdworker process, Quit it, and then emptied Trash. Voila! No more Transmit Favorite Importer!
A simple restart will do the trick as well, but if you are like me and have twenty applications open and don't have time to get back into the groove after a restart, this is a quicker way of getting your trash emptied.