Here are some presentations that I created and use to deliver in IBM events.
Most charts include speaker notes. They are all in 
Open Document Format (ODF).
I rarely use the full presentations, I select the best charts according to the audience.
- My official IBM Linux Presentation that include some insightfull charts about Open Source too
- The Best Linux Distribution
- High Availability Linux Clusters
I am also founder of the Elektra Initiative, and produced an Elektra Presentation that members of the community use to deliver in Linux events.
See also the articles I have written.