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One reason is being able to have the code open on one monitor while looking at the web page on the other. No alt-tabbing back and forth, trying to remember what I was trying to fix.
Another example is having PhotoShop open on one, with all of the palettes and toolbars on the the other, giving you an unobstructed view of your image.
Or keep email, weather, media player, stock ticker, etc., on one screen while you work on the other.
Or make the second screen a different resolution than the first, allowing you to instantly see how a page would look at different resoltions.
Believe me, once you get a second monitor, you'll wonder how you did without it. And how you can add a third....
The bigger the better but you definitely want quality. Your eyes will feel the difference.
The sad part is that I use my 12" Apple Powerbook to do most of my work lately. I really must get around to hooking my laptop to the big monitor or even getting one of those fancy Apple Cinema flat screens.
ant
Or how about this.. have two search windows open looking for some stock photography. One window with one term another with a different term. Both open... hit next and go back to the other mon which is loaded by now and look through while the other loads.. back and forth..
Multi-mons is such a work expediter that, imho, keep your 19, maybe get another 19 or maybe that 23 your were talking about, get another video card (or maybe a different video card with dual out put) and really reap the rewards.
Also, I highly recommend ultramon to manage all your monitors. Google it.
I dont ever play any games or anything, so I just bought a cheap generic dual head card and a DVI to VGA converter.