I heard they're a little slow sometimes for high end gaming, but I suspect they could handle a few bar charts, has anyone tried these for trading? http://www.displaylink.com/products.html http://www.lge.com/products/model/detail/l206wu_1_6.jhtml
I just bought one for about $65 (wholesale price) and it worked out well. Used it with my laptop while traveling on vacation (whats a vacation without a few trades right??) Its a no name brand and has about a $120ish retail price to put it into context. It would not do widescreen resolution so I hooked it up to a 17inch standard dell and worked fine. Hope that helps