I bought the LecShare Pro software, and converted my keynote address from the ePortfolio Hong Kong conference into several different formats. The results are posted on a single web page. I was told by the developers of the LecShare software that "the slowness of importing is actually due to the way MS Office works on the Mac. When the new version of Office comes out we hope that Microsoft's API is much more responsive."
I am very impressed with the output of this LecShare Pro software. The quality of the video is very good, and the process is much easier than using the other strategies that I have tried.