In case you're manic about entering contests in which the prizes are books (like me), you might be interested in the following giveaway:
2013 Blog Hop Giveaway of Awesome
There are almost TWO HUNDRED blogs doing awesome giveaways, from their own books to ebooks to Amazon certificates so you can choose your own prize. I've entered about 50 myself and I can't wait to see if I win!
(Contest closes 9pm, January 7th)
ALSO: There are some contests that are open internationally! (Listed by link)