What's Bill Gate's desk setup like? How many monitors does he have?
What are their purposes?

"Behind him, his simple, modern desk and bookshelves were as neat as
an office in a showroom. A slick, flat-screen PC sat on his desk.
Stylish black-and-white photos of his family were on the desk and on
the walls. The books on the shelves were anything but tech manuals."

Source: "Bill Gates Q&A," USA Today, Sept. 5 2000 
http://www.usatoday.com/life/cyber/tech/cti483.htm

He probably has more than one desk: one at Microsoft HQ, one at home,
one in his private jet, one in his limo... :)

From an interview with Playboy, 94/12/08:

"Gates uses a Compaq 486/25 Lite notebook (he has
 docking stations at the office and at home) and
 is looking forward to getting a Compaq Concerto
 notebook. Otherwise, Gates doesn't have lots of
 time to tinker with the newest computer hot rods."
http://ei.cs.vt.edu/~history/Bill.Gates.html

"Gates has Compaq Deskpro P200 Pentium Pro machine
 with Windows NT 4.0 Workstation at his desk in
 the Microsoft Campus at Redmond (1997 February).
 He has been spotted carrying around IBM Thinkpad
 several times during 1996-1997. Rumor says, that
 he has removed IBM stickers from his Thinkpad :-)"
http://www.sunpoint.net/~ripple/bill-faq.htm

Guess he likes Compaqs......  :)