I ran down to Fry's Electronics and picked up a BTC "ultra-slim" USB keyboard for $19.95. I plugged it in and it just works without any goofing around. What's even better is when you click on or select text input fields on web pages the onscreen keyboard doesn't pop up-- very nice.

Now for some issues.... Opera doesn't seem to understand pgup/pgdn; the arrow keys work the same as the 770's D-pad. When typing on the keyboard the power-saving functions that dim the screen/etc. don't recognize the keyboard input as activity, so it will turn itself off eventually whether you're typing or not. I expect a plugin of some sort could fix that.

Abiword works flawlessly! It understands all the normal keyboard shortcuts like Ctrl-S to save, pgup/down, ctrl+shift+arrow keys to highlight text, etc. Truly a pleasure to use. F4 brings up the normal pulldown menu for file/tools/etc. F5 will minimize and switch back to the "desktop" screen. Alt-tab switches back to fullscreen. Sweet!

As far as hooking up this beast... A USB cable has four colored wires and a braided shield (see http://pinouts.ru/data/USB_pinout.shtml at the bottom of the page). To get this to work I hacked off the male end of a USB extension cable. I then hacked off the male end of a male USB->mini USB cable like the one that ships with the 770 and connected each wire from the extension cable to the mini-USB cable (red->red, black->black, etc.). This does not work by itself, since the 770 and USB device require power. I re-hooked the red and black wires of male end of the USB->mini USB cable up to my existing red/black connections, leaving the white and green wires of the male connector unconnected. Plugging the male connector into a USB hub provides power for the 770 interface and keyboard. Confused yet? Here's some pictures. http://lbattraw.home.insightbb.com/770_wires.jpg and http://lbattraw.home.insightbb.com/770_full_setup.jpg
WARNING: very large pictures for detail, 2.5MB apiece

Larry