Remember that crazy bearded fellow named James Cameron who made everyone cringe when, after winning the best director Oscar for “Titanic,” exclaimed “I’m King of the World!” ? Talk about taking your time after an Oscar victory to choose your next project carefully, but the wait is finally over. August 21, 2009 is “Avatar” Day! Ava-wha? Yeah, I know. I feel the same way. Frankly, unless you have your finger on the movie pulse of the web, you probably don’t …