thanks for info... I'm seeking for this with certain reason. Palying with my Marantz (Audio receiver with two way rs232 communication) I discovered how important it is to fully support device's features and have two way communication.
For instance, if I go to Marantz and turn volume knob, I get volume status over rs232 - it's really important to know what is user doing manually on device. And same goes for LCD TV or Plasmas - if even not more important. AFAIK Pluto's support for those is pretty basic (changing channels,on/off), but all those devices have probably much more features. Also it is important to know if "rs232 protocol" is available, so one can add proper support.
For audio receivers I do know that Marantz's are pretty cheap and good. I'm looking something similar for LCD TVs.