My desktop: 2048x1536 on a Sony Trinitron CRT (£10, bargain).
The photo is my own, taken last week, and is a view of Glasgow facing south from the top end of the city centre. The tall building with the gold on the top is the city chambers in front of George Square.
The view is actually from the boss' office, but the windows are a bit crap (they start from 4 or 5 feet up the wall. This is the sort of office where you want a glass wall ...