I got my Wife a Garmin for Christmas, so she would stop calling me and saying "which way should I turn?". Seriously. I've got no idea where she is, or which direction she is going, and she wants to know which way to turn.
Anyway, the Garmin supports live traffic reports, and rerouting, too. She'd get a 15 month subscription to the service if I bought her the module. But it costs $160 for the module, then $60 per year after that. Sheesh.
<lots of rants deleted here to save space