We discussed ways to rearrange the room to give Shelsy her own desk, but we couldn't come up with any good ways to make it work. Then inspiration struck. Taking design cues from one of Lifehacker's featured workspaces (more pictures here), we set out to make a dual-desk room.
We bought a second desk from Ikea, moved my workbench into the middle of the room, and made my old desk the workbench. The result is that my old desk is where the workbench was, and we now have two identical desks, back-to-back in the middle of the room. We moved them against the window and set up the computers facing outwards.
The setup works surprisingly well and has been a major productivity boost. I definitely recommend this setup for anyone looking for a dual desk setup.