Good idea for a thread. I think keywords get overlooked a lot. The only category I've created is James Bond, and the keywords I used are:
fleming spy movie book british brosnan connery moore dalton craig
I didn't know at the time that the search checks all text fields, so some of these are redundant with the full category description. Maybe I should replace "fleming" -- who knows how many people have searched for "lazenby" and not found my category!