Force Field Wireless offers paint additives to prevent waves from escaping: I love this idea, but I don't want to test it. Any takers? A 32-oz. container treats 1 gallon of paint--it's $34.00. They also sell 2.4 GHz/5GHz blocking window film: $39 for a 30-inch by 25-foot roll. [via The Wireless Weblog]