I have two 22" monitors and a 32" TV. Can I plug the 2 monitors into my GTX 260's DVI ports and then plug the TV in using an S-Video cable to have tri-display.
I don't think it will work as three separate displays. The two monitors will act as two separate monitors, but the TV will just display the same thing as one or both of the monitors.
you only have two outputs from the GTX 260 (I don't care how many connectors it has, it has two)
on top of that, S-Video will limit you to something around 800x600, and not look very good at that, personally I wouldn't use it for a monitor, YPbPr, VGA, HDMI, etc are better choices
if you want to connect the TV, you need another videocard, doesn't matter what it is as long as the chipset was made in the last ~8 years, will handle any resolution that TV potentially supports