Forgive me for being dumb or missing the point, but why are people concerned with frame rates over 25FPS?
Movies, DVDs and TV's (PAL anyway) run at 25FPS and no-one complains about them being jerky.
The human eye's persistence of vision (hence POVray) is 24FPS, anything faster is processed by the brain to seem like fluid motion.
So faster framerates shouldn't matter, but lower ones definately will.
(and I know that the edges of peception can manage 30FPS, but who plays their games out of the corner of their eyes?)