I'm about to install 2003, but would also like to get an affordable Bluetooth card working. I saw this info on another forum about working B/T drivers.
If any of you want to try this with your Belkin or Mavin cards I would appreciate some feedback.
ftp://drivers:bluetooth@www.anycom.com
Go to Pocket PC Drivers folder, and Beta 2.20 SW RC1 folder and download that driver. This should work with PPC 2003.