What about ReplayTV? (Score 1)

I use an old ReplayTV 5000, which has a commercial skip feature. The newer models of the ReplayTV lack that feature due to civil action taken by Disney and others, some details of which can be found in this article. (Note that another problem some content producers had with ReplayTV was the ability to transfer television shows over the Internet directly from one unit to another.)

Though I doubt that these problems would be in store for MythTV, any company that implements commercial skip will likely be subject to the same legal action that SonicBLUE (the manufacturer of ReplayTV at the time of the law suit) had to handle.