Bored of using PPT and ODP, their are many things you can try.Following is the list :
Awwation :
1. Full Demo : http://dl.dropbox.com/u/40496552/awwation-intro.svg
2. Project Page : http://adityab.github.com/Awwation/
3. Source Code : https://github.com/adityab/Awwation
Sozi :
1. Project Page :http://sozi.baierouge.fr/wiki/en:welcome
dizzy.js :
1. Project Page : http://dizzy.metafnord.org/#intro
impress.js
1. Project Page : http://bartaz.github.com/impress.js/
2. Source Page : https://github.com/bartaz/impress.js/