The best way to achieve this without real motion capture is as Walaber said; using stills - set your cameras up to record in time delayed pictures. It'll bomb as a technique if you do hi-motion moves; but this said there is still a cut down the center between companies that use MoCap and those that use Traditional Animation.
imo, Animanium is actually an awesome animation tool; one which I've been trying to recreate for a budget market (becuase believe me Mod developers and such would LOVE to be able to use something like that and it not cost them thier first born child
)
http://www.animanium.com check it out, cause it's much better than MoCap