We're going to be agreeable and assume this picture of a MacBook Air powering 4 displays isn't a Photoshop job (It's Friday and we're in a good mood). From right to left, we've got:
An old-school, 20" Apple Cinema Display
A 7-inch Mimo 720-S USB display
The MacBook Air itself
An honest-to-goodness Apple //c running a terminal session through a serial cable
Add a Kinect and Minecraft and you've got a portable holodeck. Not bad for an "underpowered laptop," eh?
[Hat tips to Gizmodo and MacStories]