Whilst most of the conversion software that I have trialed copes with 'simple' presentations they cannot cope with things like Smart Graphics and embedded video, some even miss images and simple text transition.
Almost universally Powerpoint 2007's Smart Graphics are not shown as multiple transitions on a single slide but each transition reproduces the full slide, so you have multiple same slides instead of transitions within one slide.
Surely there must be a programme somewhere that can do this properly?
It's actually very easy to do, if you download and install OpenOffice, it will read the powerpoint file (check theres no errors first) then you can export it as a flash file. Only problem is that transitions wont be exported. I do this all the time only I build the slideshow in OpenOffice first.