Mythbusters looked at the various anecdotal and pharmaceutical cures for seasickness (which as I understand has the same triggers as stationary motion sickness), and they got positive results from Ginger extract.
Results here: http://mythbustersresults.com/episode43
Your Mileage May vary, but I tried them, to play Halo reach. Normally just looking at the Halo reach Demo makes me feel dizzy and nauseous after a few seconds. I took two ginger pills, waited an hour and then happily played Halo reach for the next four hours with no discernible side effects.
Like I said YMMV, but Ginger pills definitely worked for me.
