Do you have balls of steel? If you answered “YES!” or “SORT OF!” then you might have what it takes to flash the firmware on your T-Mobile G1 in order to get this multi-touch hack up and running, courtesy of developer Luke Hutchison.
Luke has implemented the code on the kernel level and will continue to optimize it going forward. As with any modifications to your phone’s firmware, be extremely careful as you’ll very likely void your warranty while running the risk of bricking your phone. That disclaimer aside, the process doesn’t look all that difficult if you’re handy with Linux root access.
Hutchison optimized a few programs right out of the gate: Multi-Touch Browser, MTMapsDemo, MTPhotoSortrDemo, and MTVisualizer.