FingerVU 436
When I got my FingerVU 436 (4.3" 480x272 USB Monitor), it didn't work properly under linux. The display was out of sync, and the touch screen didn't work. These are my updates for Ubuntu 10.04.01 LTS, kernel 2.6.32-122-rtai.
I only updated the drivers so I could do some initial testing. I don't support these drivers.
Display
The actual FingerVU device is the problem here. The EDID it returns is wrong. I hacked the udlfb driver and hard coded the correct EDID. This means the driver only works for FingerVU 436 devices.
The source is here 
Touch Screen
There was no touch screen support for the FingerVU device. I hacked this version from the exisiting usbtouchscreen driver. It seems to be a little unreliable when initially detecting the device.
The source is here