Hello all, I am a new 770 user thanks to Woot.
I am also a computer modifier, and like to fix annoying design features in products. In this case it is hauling a 5volt wall wart around to charge my 770, when there is perfectly usable 5volt power on the USB connector.

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This modification will make it so that your Nokia 770 can charge off of a USB port, rather then hauling around the wall-adapter. All you need is any normal mini-USB cable.

What makes this possible is that the wall-adapter puts out 5volts, which is the same voltage on a USB port.

This modification is a DO AT YOUR OWN RISK modification. It will certainly void your warranty. I am not responsible for any damage to your device by following this guide.

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First remove the battery, cover, and memory card.
Then remove the five torx screws on the back of the 770.
Two of them are located under plastic caps at the top.

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Using a plastic prying tool (iPod repair websites sell them) remove the bottom plastic plate that covers the I/O jacks
(I actually used a small screw driver as I can live with small marks in the plastic)

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Remove the faceplate.
The LCD may stick to the faceplate, but it is not glued in place, it will come undone with a small amount of pressure.

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Carefully fold the LCD over to expose the PCB.
There are several tabs at the left hand side, and around the battery housing that you have to release to get the back-plate off.

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Flip over the PCB, make sure to pad the LCD.

It is amazing that Nokia can cram so much technology onto such a small space, and with so few parts.

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Note the location of the USB connector.
To the right of it is two small gold pads, this mate to the charging connector.
The right most pad is +5volts.
On the USB connector +5volts is on the left most pin.

I used a multimeter to determine that +5volts-charge is connected to a surface mount ferrite. It is a small gray component. This is where I will run my USB voltage to.

(I don't recommend soldering directly onto the gold pad, as then your normal charge connector won't mate with the PCB)

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I soldered a wire from Pin 1 on the USB connector to one side of the ferrite.

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Carefully put everything back together.

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Power-up before plugging in the USB connector.
Then plug-in the USB connector.
Depending on how your computer manages USB power, it may turn the port off if it doesn't mount the 770, but I find with a memory card installed it stays on.

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That is it, now you don't have to haul around that dang wall charger.
Just find any mini-usb cable and your ready to go.

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Sorry folks, I don't do these mods for others, so don't ask.

/Edited to spelling, and errors