How many different types of Lego bricks have been produced?
One source places the number of different types of LEGO elements that have been made at 2,200. It is unclear whether or not DUPLO, Clikits, or Bionicle etc, etc, are included in that count.

 How Many Different Types of LEGO Elements Exist?
 2,200 different elements—or types of pieces

 How Many LEGO Elements Are Manufactured?
 Approximately 19 billion each year
 or, 2 million per hour
 or, 36,000 per minute