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>I used two monitors by adding a separate video card I already had. One monitor connected to the embedded video and the 2nd to the card. Now I have a card with two video outputs, but you can also use two cards.
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Yeah, I kind of made it sound like you absolutely had to have a single card that supported multiple monitors - that's definitely not the case.

>If two cards are used, it is important that both support the same resolutions.
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I haven't seen that as an issue. My primary monitor is 1900x1200 and the secondary monitor (off the same card) is 1280x1024. The other card is set at 1280x1024 for the third monitor.