How to fix the rotation on this mesh?

How can I fix the rotation of a mesh that I imported from another program into blender?
I tried set the rotation to different values but since its rotation is not 45[SUP]o[/SUP] or 90, it’s not easy knowing how to set it up so that it stands up with one of the faces as a bottom.

Any ideas?


One option: http://screencast.com/t/XeJiohsv