>>If you want to use your PC with two monitors, how important is to have both of the same size? The reason I am asking is I have now one monitor (23") and want to add another one. But I don't have much room on my desk for another 23" so I am thinking of getting a 19" monitor as the second one. Will it be a problem?
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>Running different size monitors is not a problem.
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>For what it's worth though, 3 monitors is the sweetspot. I run 3x24" @ 1920x1200 each = acres of screen real estate.
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>I would buy another desk to make it happen.

Three monitors ? Pah !
Here ya go : http://9xmedia.com/new/products/xtops.php#
Check out the 5x5 option :-}