I think any GeForce or ATi card could do that, as long as it has the proper connectors to your monitors. The combining and rotating of screens is on the Nvidia Control Panel for GeForce or Catalyst Control Center for ATi.
Hey, it's easy as a cake, all you need to do is plug the second monitor, in win7 you can do this by pressing right mouse button on the desktop and resolution. Then click identify and mark the monitor you want to rotate and rotate. If you have ATI card, you can do this in ATI Catalyst Control, too.