Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
This is good, why not sooner? The big question is, why didn't they A.Have the current cablecard slot interface support future cards via firmware update, or B. Have the cablecard slot interface reside much closer to root electronics (or lower in the "protocol stack" if you will) so such changes would not affect the ability to use a new card with an old slot.
Also, would be cool for the new cable card have the capacity to have more than one tuner inside and DVR software. No storage on the card of course, but it would support hooking up an external hard drive to those firewire ports on the set. To keep the content providers from worrying, the card would format the HD with a proprietary file-system or something so they wouldn't have to waste processor overhead for encryption, or a standard FS and use encryption.