It really depends on the capability of the RPTV and available inputs.
For non-HD sets you are stuck with using composite or s-video from a computer which will look terrible for computer uses, unless you are using your computer for video. Desktop and things will look terrible.
If you have HD-capabilities on your display, then there are a number of ways to get HD resolutions to it for display, but this depends on the set.
I was reading up on your Mitsubishi and it says, "It has a comprehensive selection of jacks, including three broadband component-video inputs (one can also handle RGB/HV input." The RGB/HV input is interesting because I think that's compatible with a HD15 or a VGA connector. So all you'd need is a component breakout cable. http://www.digitalconnection.com/Pro...les/SCVM3R.asp
Thanks Ian, it may be worth a buy just to try it out. I have my manual, and it looks like those jacks are for the HDTV Tuner or something. Hmm...anyone have any idea if this setup would work, or how I could find out before blowing $50?
A related question: I have a Panny 53WX53. The manual says that I shouldn't use it for computer display. Is this a "safe" statement made by Panasonic to avoid complaints about burn-in, etc. or is it really bad to use my HD set as a monitor?