As of November 2004, you can use TWO Firepods on a PC, with a special driver available from Presonus via Email (it's not posted on their website and not on the driver CD).

In the near future, a 3 Firepod driver will be released on their website which will allow 2 or 3 Firepods on one machine. Check Presonus's website at presonus.com for this update.