Bam! Here's just how fast one with nimble fingers can program Garmin's c580 StreetPilot. I also thought the Gas, Movie and Traffic data functionality was nifty enough to warrant a video tour. I like it.
Although it is a bit flawed.

Hands On Garmin's Streetpilot C580 GPS: Instant Traffic, Movies, Gas Prices...with a Catch [Gizmodo]