How can unused tracks be removed from the NLA? With autokeying enabled I accidentally moved a few objects, unfortunately they now appear in the NLA editor. I removed the actions saved and reload but I can't get rid of the entries.
This behavior has been changed after 2.66a. Just tried to discuss with the designer. As explained, it is one of the main ways to prepare some places to add NLA strips from pre-made actions, and got its advantages, too.

To make them invisible, click the third toggle on the header to exclude them from displaying.