The irony of all this is that interlacing was originally invented to *reduce* flicker!
I used to use interlaced mode but only using low brightness and very low contrast.
If you want to sit in front of a computer for a long time get a monitor which can handle 85Hz.
Alternately get an LCD screen which doesn't flicker at all (at least not noticably) ...but they do effect your eyes.
Also don't use fluorescent lights as they can interact with the screen (TV and monitors) and cause yet more flicker...
