Well, I think the best way is converting your presentation to Flash.
Some converters (PPT2Flash, PowerPoint add-in, http://www.sameshow.com/powerpoint-to-flash-pro.html#110)has pre-made
player templates to convert your presentation to Flash with Navigation/
Index bar, then you could control the playback by just clicking pause
and play button. If you want to advance to the next slide, you could
click the next button. Also, you could jump to specified slide by
clicking the corresponding slide in the thumbnail view area. You will
get it after viewing this presentation with navigation bar. http://snipurl.com/presentation-sample
