Not much to say on this one. All you need is a DS connector, a USB connector, some wire and solder, and just criss-cross the connections like this while clamping the metal shielding together (probably best not to skip this). And you'll probably want a usb extension cable (found everywhere and often included with PC peripherials), or else this fragile adapter could bend and break. Also, you'll want to use some electrical tape or heatshrink to cover the exposed area (I haven't done that yet. Will tomorrow at work.)

You can always just buy a usb power cable for the DS but I could never find any USA sellers for them. Beware of dealxtreme's version, because thats the one that failed on me which led to me resorting to this mod. The wires inside that cable are super thin and can easily pull apart inside, leaving you wondering why your DS wont show the charging light anymore.