Here's a follow up to my rant about WP supporting import via Keynote's XML features:
http://www.macdevcenter.com/pub/a/mac/2003/11/18/keynote.html
Pretty basic stuff, but I still like the idea of wimpy point being able to slurp up XML versions of presentations. Interestingly, if we add export to Keynote, a user could then use Keynote to export the WP presentation to Powerpoint.
OmniOutliner has numerous export options as well:
http://www.macdevcenter.com/pub/a/mac/2003/12/12/omnioutliner.html?page=2