By Leo Babauta I am overjoyed. Zen Habits has just finished its 4th year of existence and every year has been better than the last. This year has been no exception. How great a year has it been? Zen Habits grew from 150,000 subscribers to well over 200,000 and topped TIME magazine’s Top 25 blogs for 2010 (after also making it in 2009). But the joy has gone beyond numbers — for me both professional