iPod Lap Timer. Very quickly thrown together OS X app (it wasn’t around by this time yesterday) that shows the stored Stopwatch data on your 5G iPod (”with video”) or iPod nano. Comes in source and binary - the source also features a text file, documenting the format (the primary reason that this tool was even created).
(Also, reportedly, Apple is stunned that I have adopted the tactics and ethics of a hacker to break into the iPod… ;))