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MDGeist said:
modern scanner can go up to 4800dpi... any stuff that needs that much res ?
Scanning large film negatives or slides. Other then that, nothing really needs 4800dpi.

MDGeist said:
or does higher dpi mean it will scan better at lower dpi, too ?
so a 4800dpi scanner can scan better images @ 1200
than a 1200 scanning 1200 ? o_O
I would say yes. Scanners usually use CCD sensors. Just because the sensor goes up to 4800dpi doesn't mean it can actually resolve 4800dpi. Scanning at 1200dpi on a 4800dpi sensor should result in better quality then a 1200dpi sensor scanning at 1200dpi, depending on the quality of the sensor of course.