For anyone thinking of dual and more displays this new article has a lot of new information. Summary: Almost all graphics cards offer connectivity for two monitors. However, the Dual-Display functionality goes largely unused by modern games, although the potential to use it in order to add a new dimension to game play is there. We take a look at the dual-display capabilities of several cards, gauge the facility of their dual-display set up and check out their performance in the few games that feature multi-monitor modes. http://www.tomshardware.com/graphic/20040216/index.html
Got some good pricing on dual heads... ATI 9200 apg 64 $44, Geforce 4 MX 64 AGP $45, Geforce2 64 PCI $40... Found them all on ebay... maybe you can find them cheaper elsewhere but if you negotiate with them (if buying bulk) cna get the price down. For example, ask them to deal outside of ebay , they knock off 10% and plus ask them to not accept paypal, knock off another 5%.