From my searches on the net, there hasn't been much info or help on using cross-compiled libusb code for ARM (or anything else), so in case some poor soul looking for help finds this humble blog, I hope I can be of assistance!
And basically anything that I figured out that might be helpful in some way to anybody, I'll throw up here for good measure - both so that I don't forget it, and so people can benefit.
Good luck!
Nic