Greg Knauss’ The Devil’s Dictionary (which I’ve mentioned before) has some wonderfully nasty definitions of things computer- and Web-ish. He updates it every now and again, and he’s added some new entries since last I checked. My favourites:
GNU License, noun
An impairment of vision, causing the victims perception to be limited to black and white.
The quality of being easy, usually championed by the difficult.
(One nitpick: “usability” is a noun; “usable” is an adjective.)
extreme programming, noun
A method of software development that combines all the charm of backseat driving with all the efficiency of a marital squabble.