*your sexiness may vary.
This thing sounds kind of cool, if you’re the type of person who likes to hear yourself talk. You use a web app to record a set of sounds (“At the next intersection, wang a right”) and then download them and stick them on your GPS unit — assuming you have a TomTom brand one. They’re hoping to have more brands support them in the future — Garmin, MyGuide, those guys — but that probably won’t be for a bit, so bookmark it and try again later.
GPS instructions with your own voice [Gadgetizer]