Four screens (effectively) on the MacBook Air at the office in DC.
Apple //c tied into a terminal session via serial cable, 20-inch Apple Cinema Display, and 7-inch Mimo 720-S USB display. More info on the serial terminal setup in my blog post.
[[ Hah -- I got Gizzed, it seems. Yea, I should've hooked up the iPhone 4 (which took this shot) and iPad into the mix via AirDisplay. And hey, don't knock the Magic Trackpad -- it beats the hell out of a mouse for all but certain games. Oh, and the Dell down there -- they make me keep it around. At least it's headless!
UPDATE: This *was* the dayjob office. In January I left all that behind (well, I brought the hardware home with me!) and am now self-employed, working on TouchArcade.com full time. And it's awesome.