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Most of my presentations are posted on slideshare: http://www.slideshare.net/RussellSpangler/presentations which includes past presentations that I have done for the Cincinnati user group. Some of the topics I've covered are data preparation, basic chart design, and mapping.
Also my Tableau public profile is located here: http://public.tableau.com/profile/russell.spangler#!/ and both of the above mentioned visualizations should be downloadable from my Tableau public profile.
If anyone has any questions you can find me on twitter @russellspangler