I didn't actually add the Service_Categories column because I guess it was too complicated--Gossamer added it for me. They have it so that when the new linkowner is filling out the form, when they get to service categories, they have to check the boxes of whatever service categories they offer.
They had sort of a special search form set up similar to this, except it was on the row it is now instead of the sidebar: http://caribbean.com/villas/
They had sort of a special search form set up similar to this, except it was on the row it is now instead of the sidebar: http://caribbean.com/villas/