Dual monitor setup question

I'm building a new computer with an 8800GT video card. I have a 20" LCD monitor/TV with VGA input that I was using for the OLD computer, and I do mean OLD! LCD is just 2 yrs old though. Max res on it is 800X600(sucks I know). I'm going to buy either a 22" 1600X1000(or whatever the res that matches that is) or a 24"(1900X1200?). The 20" is standard(4:3), the new monitor will obviously be widescreen. I was gonna just sell the 20" once I got the new one, but it seems like I'd be lucky to get over $100 for it. I bought it for $400 2 yrs ago, so that kinda hurts. I was wondering if there was some way that I could hook both the 20"(4:3) and the 22/24"(16:10) up to the video card and use them together? I know you're supposed to have same monitors for dual screen setup, but was just seeing if there was some way I could put the old 20" to some use instead of ditching it for pocket change.