Has anyone found a reliable wireless bridge? Alternatively, how do you handle devices which do not support wireless but which there is no easy way to get a cable to in a retrofit scenario?

Every wireless bridge I have tested just hasn't been reliable enough to deploy to a customer. Most of them just become disconnected when the fail but one of the bridges I was testing came back before the access points after a power outage and decided that since there weren't any other access points in range it should make itself an access point and started handing out IP addresses to clients and took the entire network out. Unfortunately, that was the only device that was proving to be reliable.