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
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