You could enter the one at
http://www.webaward.org - closing date 31st May for the 2008 awards. It has a specific category for directories which sounds right up your street, and knowing your site quite well I would guess you'd have a pretty good chance of securing at least 2nd place


heh.
Looking around a lot of the 2008 stuff has already been decided
I can't recall any 'business awards' off the top of my head that aren't aimed directly at start-ups or entrepreneur type businesses. Is it specifically a business award that you are after? (or more 'website award'?)
..and welcome to the forum of course
James.