I've published a new firmware for ORbit16 that allows to control 10 servo using USB port. A GUI written in VB.net is available for testing the interface. A complete manual (now only in italian language) is available:
In the examples page I've uploaded a demo for PIC24FJ64GB002 that shows how to control 6 servo using interrupts.
Source code for USB servo controller (both gui and firmware) will be available to whom will buy a future "servo bitpack". If you're interested in this board (an expansion board for connecting up to 12 servo) please let me know.