My non-widescreen monitor in work has been rotated for the last couple of years (until last week anyway, pc died and the driver that allowed it on my previous set-up weren't installed when I got it back).
I would if i could at the moment but i dont think i will be able to type with my hands sideways (Lappy)
Dosent turning it 90 degrees mean turning your head around? We do it at school alot..The teachers have no idea how to turn it back