Basic Resources
Multitouch/Testing/CheckingMTDevice - How to find your device ID and test it for multi-touch capability
Multitouch/Testing/UsingGeisview - Using the geisview tool to see if you're getting expected events
Multitouch/Testing/Evemu - Recording and playback of touch events and gestures; extremely useful for debugging
Multitouch/Testing/UsingMtview - A visual feedback tool that shows touch points, sizes, disconnects, offsets, etc.
Multitouch/Testing/UsingUCube - Another visual feedback tool, but instead of touch points checking, does gesture checking
Multitouch/Ginn - A tool to provide multitouch support in legacy applications without recoding; Ginn can be very helpful in testing a MT setup
Multitouch/Calibration/Ntrig - A tool for calibrating N-Trig hardware.
Additional resources
Multitouch/PyMT - Testing multi-touch with Python MT