Lots of people have bought surround-sound speaker systems, but aren't truly surrounded by sound: They never hook up the rear speakers because they don't want wires trailing all over the living room. Roomcaster, a wireless surround-sound technology developed by Radiient Technologies, got a big boost when it was adopted by THX. The system's specs are impressive: It can transmit uncompressed, 24-bit, up-to-eight-channel digital audio at distances up to 30 feet using a wireless mesh network. The company plans to sell a basic system that consumers can use with their existing speakers for $2,000. But the real action happens when the Roomcaster technology gets integrated into speakers, DVD players, and other devices produced by other manufacturers, something that should start happening in the next year or so.