Have you ever noticed how little sense the placement of zip codes make? Sequential zones are an entire city apart. Sometimes there are even zip codes wholly contained within other zip codes. It takes a visual zip code map to make sense of it. Huge.info has just such a map using an interactive Google Map and custom overlay images.
At Mashup Camp last week each attendee was given one wooden nickel with which to vote for their favorite mashup. Then on both days there was a "Speed Geeking" session during which attendees rotated through the Great Hall getting 5 minute demos from each of the 20+ mashup contestants.