When the stand on one of my three desktop monitors broke last month, I decided to switch to a multi-monitor stand. I got an Ergotech Triple Horizontal LCD Monitor Arm Desk Stand (100-D16-B03). I can't say enough good things about the design -- it allows every possible adjustment or configuration, it's easy to put together, and it's very solid. (Also, word to the wise: This monitor stand was $432.00 on Amazon, but only $199.95 at PC Connection, which is an Ergotech participating retailer.)
Using the stand has helped free up a lot more space on my desk, including space behind the monitors. Definitely worth the investment.
Here's what my desk looked like a few months ago before the monitor stand:
Here it is today, with the monitor stand: