As in tables that do tricks! First up, The Flip Table from flipfurniture, which turns from a neat coffee table into a dining table with stools. Excuse the pic size, but I couldn't work out how to save the full size photos from their site. Mosey on over to their site to check out the high quality pics yourself and to catch the video.
And second, a ingenious expanding circular table from DB Fletcher Design, best illustrated by this video, but you can also get the gist from these photos:
I just love furniture that transforms, hides away or otherwise does nifty things!