Forbes has updated their annual guesses on the earnings of the most successful authors. This year’s list, covering June 1, 2007 to June 1, 2008, estimates the top 10 authors “pulled in a combined $563 million.” 1. J.K. Rowling, $300 million2. James Patterson, $50 million 3. Stephen King, $45 million4. Tom Clancy, $35 million5. Danielle Steel, $30 million6. John Grisham, $25 million6. Dean Koontz, $25 million8. Ken Follett, $20 million9. Janet Evanovich, $17 million10. Nicholas Sparks, $16 millionForbes