Another USB charger: hama mp3 travel charger with USB Port 00014056. No cable included, two leds, green while plugged in, red while charging.
It is easy to recognize it because it is very ugly :-) Picture here:
http://ecx.images-amazon.com/images/...500_AA280_.jpg
Almost everything works -- writing with stylus, buttons, etc. I was unable to turn the device on after auto-shutdown while charging. I have to stop charging, boot it up, and then start charging again. But since DR1000 has many similar quirks it could be DR1000 bug as well.
Cheers,