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.

Was this a stupid question or something?  I really would like to know.

I'm currently using a 24" LCD for my main monitor, and a 19" LCD as a second.  I just extended the desktop over to the 19".  I use it to watch TV, movies, and monitor the system while I work/game on the primary.  Works like a charm.
 
24" is set to 1920x1200 and 19" is running at 1280x1024.

It doesnt matter that the monitors are different, it will work just fine.    The biggest mistake Ive seen people make in that situation is they try to run both monitors at the same resolution.    Like firebird has his set up, just remember to set them each to their own native res and you'll be fine.

yup just plug each monitor into a different video connector on the video card and viola it works fine.

The horizontal length of that 20" is about the same size as the vertical length of a 30".  2 vertical oriented 20's nicely complement a 30". :}

well that is extremely good to hear... thank you so much.  I've never used  a dual screen setup before, just seen setups on the internet and all the ones I've seen were same monitors, so I just assumed.  When you say extend the desktop, that's where you can drag things from one screen to the other right?  How does the other way work.... tab to get to other screen?