I'm a big fan of James Altucher. His concept of building your "idea muscle" by writing down a page of random ideas everyday has dramatically improved my life.

Two of my favorite posts by him

How I screwed Yasser Arafat out of 2 million dollars and lost 100 million in the process

http://www.jamesaltucher.com/2011/01/how-i-screwed-yasser-ar...

How to be the luckiest guy on the planet in 4 easy steps

http://www.jamesaltucher.com/2011/02/how-to-be-the-luckiest-...