Finite State Automata in Lucene
You can view the slides here.
This was the first time I used Google Docs exclusively for a talk, and I was impressed! The real-time collaboration was awesome: we each could see the edits the other was doing, live. You never have to "save" your document: instead, every time you make a change, the document is saved to a new revision and you can then use infinite undo, or step back through all revisions, to go back.
Finally, Google Docs covers the whole life-cycle of your talk: editing/iterating, presenting (it presents in full-screen just fine, but does require an internet connection; I exported to PDF ahead of time as a backup) and, finally, sharing with the rest of the world!
(Note: Opinions expressed in this article and its replies are the opinions of their respective authors and not those of DZone, Inc.)