This is a little off topic but I would also like to charge my 770 and n800 off of a USB but I am looking for a different solution. I would like an adapter that plugs into my mini-USB that converts the plug into the power plug, I have seen things like this for pocket pc's, I have looked but can't make heads or tails of what exactly to search for. Like this
I found this but I am looking for something that is not so much and fits over the standard data cable for my tablet

I don't know if it is related but I recently have a big problem : I couldn't flash my device anymore ... In fact I think my laptop's usb ports are nearly dead ! Probably because it's normally limited with 500mA and the Nokia wants more.
- when I plug my n800, the OS doesn't detect my sdcards anymore
- usb charging continues to work
- Nokia flash updater doesn't detect my device (windows & linux) while n800 seems to be in usb mode (icon on the upper right)
- my usb keys aren't detected anymore on my laptop !
- my usb mouse works fine on my laptop
- I tried with another usb cable and I've the same problems

...so pay attention if you want to charge via usb !

I found something similar, and cheaper. It was either at a truck-stop/travel-center or at a compusa, but they are about $10 - search for "retractable nokia usb", and then make sure you are getting the ultrasmall plug version.

ericdkirk,

$5.50 shipped from https://www.dealextreme.com/details.dx/sku.4860

Anyway the tablets can drain much more than 500 mA so it is still possible to drain the battery even while connected to such charger.
But this is still a good alternative to carrying a charger, especially when a power socket is not available and one has to carry a laptop (airplane for example).

Don't some airplanes have electrical outlets now? The trains I take do, and I think that there were outlets on my last flight from New York - London.

You fly in a better class