PepWave makes a really good wireless to Ethernet bridge - the PepWave Surf 200. They are pricey but we found an eBay seller with a bunch of them:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190354462623We bought a few of them and they came into today. We used the "Make an Offer" and offered $20 each for 3 of them. They accepted and the bridges came in a few days.
They took a little setup, but worked as expected fairly easily. The PepWave 200 makes a connection to your Wifi network and has an Ethernet port on the back. I used a laptop to configure which network to connect to and it's settings. Then, plugged the IO-204 in and instantly it connected to the servers. The wireless bridge comes with a 9dBi antenna, a long ethernet cord, and power supply. It's 5v at 3amps. First thing I did was hack off the connector and hook it the IO-204 so the IO-204 powers up hte bridge with the 4A supply.
It's a pretty cheap wireless solution. Let us know if you try it.