The gaming adaptors work, the ones with ethernet connectors, not USB connectors.
The ones geared toward Playstations and Xboxes.
I was going to steal the one I got for my PS2, but decided to hard wire my HR21.
(lot of good it did, since DOD isn't available for the HR21 yet)
Panasonic Viera TH-46PZ800U 46" Plasma HDTV
TiVo S3-65 HD Hours-Lifetime
TiVo HD 20 HD Hours
DirecTV HR21-700 80+ HD Hours
DirecTV HR20-100 80+ HD Hours
Harmony 880 Remote Control