Apple iPod Car Charger + Home AC Adapter 1st Gen (NOT for iPhone 3G)
Avoid These 3rd Party Products
The iPod car charger and AC adapter I purchased were very poor.  When plugged into my 3rd generation iPod, they would freeze the screen and not charge 90% of the time.  Only after unplugging and replugging them several times could I get the battery icon to animate indicating a charge, and even then it would only last for a few seconds before freezing.  Do yourself a favor and purchase an Apple brand Firewire or USB charger.  They are ridiculously expensive, but at least they are guaranteed to work.