“Virtual” desktops are for wusses.
The new Powerscape Ultra HD from Zenview is the ultimate in desktop monitor rigs. The system features a huge 30″ diagonal widescreen LCD at 2560×1600 resolution, flanked by four 20.1″ “surround” monitors in portrait mode at 1200×1600 resolution each, for a total screen resolution of 7360×1600.

The entire system is over 73″ wide and 25″ deep, so you’ll need a very large desk for this one. Priced at $5999 USD, it’s certainly not for the meek. You’ll also need to provide your own video cards too, so expect to spend another $1000 or so on that.
For those with smaller budgets and smaller desks, their Powerscape 21 and Powerscape Elite come in at $3599 and $4399, respectively.