OK the bvdd-iwmmx whatever file works for me thanks for the help.
Ref the last reply, the iwmmx whatever file uses your zaurus accelerated graphics chip or something - I get better performance here with it.
On performance, try lowering that bitrate to under 1mbit/sec - zaurus seems to have issues over that rate, alternativy in the playback try enabling overclocking* I find the top turbo one will hang my zaurus, but the top 'overclocked' setting yields better performance than the lower turbo setting, I presume that the limitation on high bitrate videos is buss bandwidth or something perhaps someone will clarify.
*DONT BLAME ME IF YOUR ZAURUS CRASHES AND BURNS INTO A PILE OF MOLTEN PLASTIC I have however never had any adverse effects from overclocking my zaurus.