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If your business is in web design/development, dual monitors are probably the single biggest time-saving hardware purchase you can make.
Steve
<added>Then look into an 8-button wireless mouse (the 2nd best time-saver).</added>
Dual monitors really expand your work space. The main problem I see is trying to get gamut synched between them. I've yet to get the monitors to display exactly the same, with my work desktop or the notebook at home.
Matching may depend more on your vid card than your choice of displays: it was virtually impossible to "match" these with my previous nvidia card (whose model I don't now remember); it was pretty simple with this one: GEForce FX 5500.
I don't think I would go back to one monitor, even if offered a "tv" sized one....