At the moment, the product and vendor IDs for the FTDI chip are the factory default. While it works fine, it might be worth getting a custom product ID from FTDI – it looks like they provide them free of charge. It would make it autodetection a little more reliable. Not high on the list, but something to consider.
-Matt
I don’t know much about it, just was reading some of the FTDI spec docs to learn a little more about the USB interface. It appears that the PID and VID can be set in the internal eeprom using USB commands. See bottom of page 34 in http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT232R.pdf. It appears that as long as you use the FTDI VID, they will give you a free block of PIDs if you ask nicely. I suspect getting a VID would require going through the USB trade group and paying a lot of money – not really worth it IMO.
-Matt