Using 1 Gaming Computer For 2 People?

My fiance and I have recently taken interest in City of Heroes (she's currently got a character on my account). She's got a cute little netbook, but nothing nearly powerful enough for a 5-year-old MMORPG, let alone if we take interest in Champions Online! I am reticent to buy a new gaming computer simply for what amounts to a passing phase. Has anyone had any experience using one computer to control two monitors with two sets of input devices (e.g. two keyboards and two mice, or one keyboard, one mouse, and a 360 gamepad, perhaps)? I have seen one solution that might work, but not much information from users that I can find. In short, does anyone have any experience with setups like this?"

http://ask.slashdot.org/article.pl?sid=09/05/22/020208