Perhaps I'm confused, but shouldn't the distance between your elbows and eyes be roughly the same regardless of whether your sitting or standing? If not, then what's the best non-(cheap/easy/portable) solution that addresses the issue?
It should be the same, but it's easier to tweak ergonomics for a non-portable set-up.
I can't change the height of the desk, so I set the keyboard on the desk and adjust my chair so the keyboard is at the right height. Then I put books under the monitor until it's at the right height. Like so: http://abughrai.be/pics/desk4/DSC_8568.JPG
For portability, there's not much you can do. Laptops are great, but they have trade-offs. Whenever a decent head-mounted display comes out, it will drastically improve the ergonomics of portable computing.
