The .CHANNEL SET command works for WD TV just like Roku (you'll find various references to that in the forums). The difference is that getting the channel list out of the WD TV is less easy than Roku so we'll list some common ones here as it's likely the channel numbers are the same between boxes:
<code> name = AccuWeather;
"service_id" = 28;
name = "AOL HD";
"service_id" = 58;
name = CinemaNow;
"service_id" = 25;
name = ComedyTime;
"service_id" = 51;
name = DailyMotion;
"service_id" = 35;
name = Facebook;
"service_id" = 17;
name = Flickr;
"service_id" = 14;
name = Flixster;
"service_id" = 41;
name = Hauppauge;
"service_id" = 48;
name = "Hulu Plus";
"service_id" = 31;
name = Kannuu;
"service_id" = 79;
name = LaunchPad;
"service_id" = 30;
name = Live365;
"service_id" = 13;
name = "MLB.TV";
"service_id" = 38;
name = myTV;
"service_id" = 80;
name = Netflix;
"service_id" = 26;
name = Pandora;
"service_id" = 20;
name = "Picasa Web Albums";
"service_id" = 19;
name = "Red Bull TV";
"service_id" = 59;
name = "SEC Digital Network";
"service_id" = 55;
name = SHOUTcast;
"service_id" = 18;
name = "Skitter TV";
"service_id" = 45;
name = SlingPlayer;
"service_id" = 57;
name = Snagfilm;
"service_id" = 47;
name = Spotify;
"service_id" = 37;
name = "Tunein Radio";
"service_id" = 23;
name = Vimeo;
"service_id" = 39;
name = "VUDU Movies";
"service_id" = 40;
name = WatchMojo;
"service_id" = 50;
name = "XOS College Sports";
"service_id" = 54;
name = YouTube;
"service_id" = 15;
name = "YouTube Leanback";
"service_id" = 16;
name = YuppTV;
"service_id" = 62;
</code>
Thank you.