maps.huge.info: Zip Code Boundary Map

Nice use of Google Maps: where's the boundary of my zip code? my town? my county? I particularly like the click-on-the-map-to-explore nature of this one. (See also MelissaData’s comprehensive set of lookups, although I don’t like their we’d-rather-you-registered daily limit; and Ben Fry’s lovely zipdecode applet.)