I have an 8" insignia device (flashed with Chumby 8 firmware) and the Wifi Adapter stopped working.  It says "MAC Address: undefined" and I'm pretty sure Linux doesn't find the adapter altogether.

I thought I might try a USB wifi adapter.  Is there a particular chipset of USB wifi adapter that is more likely to work?  Do I need to do anything special to get the chumby to use the USB wifi instead of the built-in wifi?