Update: Be sure to read this whole thread - the information I provided below isn't quite right; gomadic does not offer a "real" NC charging adapter, so the NC will not charge at full speed with their adapters.
I was a bit cranky when I discovered how non-standard the micro-USB jack on the NC really is. Searching the forums here did not provide any 3rd party sources for car-chargers and so on, so I spent some time googling around and found a company with an extensive line of universal power accessories, and supports the NC via a special connector tip:
http://www.gomadic.com/brand-barnes-...cessories.html
Personally, I'm liking that universal charging station - I've been using something more basic for the past several years to charge family phones, it might be time to upgrade.