Wow!  Thanks for all the responses.  If you haven't responded yet, please leave comments at Should VS support dragging code files onto a secondary montior?, even if you agree with everything that has already been said.  Also, feel free to say, “hey, i use just a single monitor, so this doesn't affect me.”  I'm interested in the number of people who use multi-monitor versus those who don't, and of course, the number of people who want this support.

Thanks again!