Currently I am using the bed of nails Wizard in Mach 3, but I would sure like to find something faster. I can setup a small machine dedicated to probing or use one of my current working machines, and I can setup for either Mach 3 or LinuxCNC (formerly EMC2).
Its not really about machine speed, but about routine efficiency.
This routine looks really promising, but as near as I can tell its proprietary. CNC USB Controller - Digitizing 3D model with probe - YouTube