Another Override based question:
How can I find out which mission bit is which mission?

If you're meaning the original Override rather than the Nova TC then I highly recommend a utility called Plug Checker. I think you can find it on the addons pages although it may be an older version.

No, I meant the Nova TC.

If you're looking for the mission bits associated with a particular mission (or whatever has a NCB set or test field, for that matter), just look that resource. If you're looking for the missions associated with a certain mission bit, then the best way is to export all mďsn resources with ConText, and then run a global search for bxxx on the resulting text file.

Some more programs:
EVN Mission Viewer - allows quick and easy searching of bit strings, although only for missions
Mission BitMap (nuts the links are dead - is this still available anywhere?)
BitFinder