I had a team-mate who swore by having one monitor in portrait mode where he kept his word/specs/reading whilst he worked primarily on the landscape monitor. Seemed to work for him.
Also, HN seems to have dropped the "∝" symbol from the title!
It wouldn't take much carpentry to set them up in landscape, maybe with a cinder block or something in the back as a counterweight.
Unfortunately my carpentry skills lacking, and the Dell Single Monitor Arm [1] are NOT suitable for mounting 2 monitors on top of each other (not enough height).
[1]: http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l...