i have a few systems, DVD player, couple steroes, and 2 TVs. i basically have lots of wires and splitters and a couple switch boxes and most of my stuff can be played on either/or both TVs at once.
i was bored one afternoon.....
but to answer your question, i got around most of it by getting S-video cables. you plug the cable into your PS2, then on the other end you plug the S-video plug into one TV that supports it, and then you plug the composite yellow video plug from the same cable into the 2nd TV. voila. now you just gotta put the sound somewhere...it's only gonna go into 1 unless you split it.