Freelance Writing Contest List – http://www.freelancewriting.com/contests.html
This is another list of contests, alot of these I really think are good though because tons of more unusual types of subjects for competition can be found, and the entry fees are reasonable for most of these. (ranging from $0 - $50 for most of the contests.. even the $0 entry fee contests still have rewards to them)
National Novel Writing Month (NaNoWriMo)– http://www.nanowrimo.org/
You are supposed to write a 50000-word novel during one month (November). This is mostly a contest with yourself.