A variation of the "used prop table," that I've used to some success, is a "prop dump" basket. I'll just put a spare laundry basket at all exit points; glo tape makes it even easier to see, and if you've got fragile props, line the bottom with a nice squishy blanket. I like the basket, because it has the added benefit of portability. At the end of the night, I can just pick it up, and make a tour of the props tables, re-distributing the props in one go. I've found it a favorite with hurried actors, though I do still find myself going through pockets and raiding dressing tables to retreive props, once in a while.