Google today announced their Online presentation application. It isn't going to win any awards for beauty (baaad templates!) and it is next to useless in the Safari Browser - much better in Firefox - but it is a huge step in the right direction.
The chat and collaborative features in Google Docs and Spreadsheets are there which opens the possibility of online presentation building and "presenting." However, it has obvious downsides as well. It is certainly not as full featured as current presentation tools like Powerpoint and Keynote.
It doesn't do:
Animations of any kind
Advanced image manipulation
Advanced text formatting
Sound
Video
Exporting PowerPoint files
