I am using 3 HDTV's +1 monitor+ laptop screen...

I use a 22" Viewsonic 1080P monitor on my desktop XP pro-64(Quad 4/6GB DDR2). From this I am tied into both a 24" and 47" 1080P HDTV. Although my current G/card only allows 2 displays at any given time, I have the option to switch between all 3 displays as independents or clones. Very handy for photo/design rendering and such. The whole sound system is handled via Dolby 5.1 sound expander (on XP)which can then be put thru my home theater system. I also have an 18" L/top(W-7 Pro64-dual core) running to a 26"1080P HDTV. Because of the "snap" feature, I can run 2 independent sessions on the L/top and another 2 on the 26" HDTV. I find the newer enhanced Dolby system on the L/top has greater sound differentiations so I run a separate line into the Aux input of the home theater system. I realize this was meant to be a "monitor" question, but I felt others might be interested in the sound enhancements available as well.