My dual 24" widescreen Dell monitors arrived this evening. I plugged in the first monitor to the DVI port and moved the existing 20" 4:3 flat panel over to the VGA port of my ATI Radeon 9800 128MB video card.
The native resolution of the new monitor is 1920 x 1200 and the native resolution of the 20" monitor is 1600 x 1200. Sadly, while I could get the 24" going at 1920, I could only get the the 20" monitor up to 1280 x 1024. There is no way I could power to monitors at 1920.
It appears that I will have to purchase a new video card. The research begins now for an AGP video card with two DVI outputs that can power two monitors at 1920. Luckily, I don't play games on the machine so I am not looking for state of the art graphics.