I've just had a few frustration days trying to get RISC OS Pi networking with a wireless-ethernet bridge/adapter. As I only paid $25 for the bridge I got what I paid for. The distance from my pi to the wireless hub was too much for the cheap solution.
Currently RISC OS doesn't support a wireless-USB connection so either cable or the bridge/adapter is necessary.
Now have a $59 bridge waiting to be picked up. Will be able to check it out tommorrow night and will post the outcome here.