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The video training is good on this site: http://www.tableausoftware.com/learn/training
Also the information lab has some great beginner articles: http://www.theinformationlab.co.uk/2012/03/27/tableau-for-excel-users-part-2-calculated-fields/
I would also highly recommend buying Stephen McDaniel's Rapid Graphs book. There's a version 7 available, and a good price for digital version: http://www.amazon.com/Rapid-Graphs-Tableau-Software-Actionable/dp/1475212003/ref=sr_1_1?ie=UTF8&qid=1340026271&sr=8-1&keywords=rapid+graphs+with+tableau+software+7
Great links and book on the way!