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At <a href="http://orancle.com/openworld">Oracle Open World 2011</a> there has been a large number of MySQL presentations. You can download the slides of my two presentations at <a href="http://effectivemysql.com/downloads/ExplainingTheMySQLEXPLAIN-OOW-2011.pdf">Explaining the MySQL Explain</a> and <a href="http://effectivemysql.com/downloads/ImprovingPerformanceWithBetterIndexes-OOW-2011.pdf">Improving Performance with Better Indexes</a>.
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You can find additional supporting information for these presentations in the <a href="http://effectivemysql.com/book/optimizing-sql-statements/">Effective MySQL: Optimizing SQL Statements</a> book.
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