A long time ago, I bought a Grandtec AVW-1000 wireless video link to show videos in a class room without having to run cables back to the projector. I no longer have the classroom but I still have the AVW-1000. The problem is that it uses the same frequencies as my wireless network and the cordless phone.
Here are my notes on figuring out what channels to use on each device. So far, I've only included the AVW-1000 and 802.11b but it's a start.