TomTom's navigation app had claimed compatibility with all iPhone and iPod touch models. Then suddenly, somewhere along the primrose path to publication, original iPhone and iPod touch support evaporated. But no more. TomTom's pushed an update that allows for turn-by-turn navigation, but of course, you'll still need the car kit to work. Was this the missing link between your $100 and owning this app? [Warning: iTunes link]
[Thanks, Scott M]
Update: So, the Car Kit for iPod touch has hit TomTom's e-store, and it's $20 cheaper than the Car Kit for iPhone due to the lack of handsfree support (we guess, anyway). Thanks, Philippe!