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Why is Google's current nasdaq market cap almost twice the current share price * the No. of shares outstanding?
For each class A share (GOOGL) there's a class C share (GOOG), hence the missing half in your calculation. The almost comes from the slightly higher market price of the class A shares (due to them having voting powers) over class C (which have no voting powers). There's also class B share which is owned by the founders (Larry, Sergei, Eric and perhaps some to Stanford University and others) and differs from class A by the voting power. These are not publicly traded.