With every house wired with coax cable already, it would be a great feature to provide a coax out of the Boxee. Some may see this as a step to the past and I'm not recommending to get rid of the HDMI capability, just that every house and every room is built with coax cable and most of it, for HDMI consumers, it goes unused. I personally use an RF modulator out of my DirectTV to push the TV signal to other low end TVs in my use. This comes in especially handy during the Super Bowl when you want to display the game on multiple TVs. The main TVs in my house use HDMI for HD viewing but when you want to drag a TV out to the porch where you're grilling, who needs HD and what else has the length, low cost, and ease of setup than coax cable.
Thanks for your time;