Hmm, you're right it would probably run a bit faster as a JOIN, I just default to using subqueries by nature.

Re:Theme with massive paragraph - it was based on a magazine wordpress theme and we're yet to edit it down.

We use silverback every week, and it's a joy to use. Once we've run 10 or so test we queue up all the videos, watch them back to back, cringing every time somebody trying to search in a tags box etc, making a list of the screw ups and tally marking every time we see them. Painful, but amazing feedback.