I put an order in earlier for one of the Sparkfun bluetooth boards designed for the Arduino (
http://www.sparkfun.com/products/10393). Much more expensive than the module I'm currently using but I want to see what differences there are in practice.
None of that helps with my attempts to get a remote end bluetooth/USB connection working. I'd like to find out how viable it is to control a camera or webcam via bluetooth. I've put a power socket and voltage regulator into my after-market battery pack for my Canon 550D, if I can get the rest working I'd like to put a bluetooth module in there as well (and one end of a short USB cable) so that the EOS utility could be used almost wirelessly.
Right now I'm experimenting by connecting to a SURE GPS unit or the USB adapter on a Arduino Pro-mini. Both convert a USB signal to a serial line. The SURE GPS module already has a similar bluetooth module built in (which works well) so I've got something to compare against.
Bob