Linda, most people think of "MR" as "Mister". While Medical Research and other competent names are available, "Mr" has the unique advantage of being one of the most accepted two-letter combinations in the English language. To me, such a circumstance has far greater value than using MR as an abbreviation.
Frankly, Linda, if you develop this site into a magazine concept as mentioned above, and actually coming out with a "Mr." magazine, getting a couple of investors and perhaps hiring some good editorial talent and online marketing talent, you can probably parlay this name into a cash cow of several hundred thousand dollars a year, with a potential liquidation in the millions (once the economy picks up).
Of course, other considerations have to come to mind, but consider this to be a counterpart to "Ms" magazine...and you can see the possibilities.
If you don't want it, though, I could use it, as it is the initials of my own name, and it would make it easy for me to remember my email address .... LOL... Good luck!