Great speech from Scott Hanselman that shows us how we can be better developers using social networking and he proposes that every developer needs a blog.
Scott gave an advice I really liked it. He says "Remember, we are all immature!". If you think like that you will feel more confident to write something out there. You don’t need to feel afraid of not writing the best code. Just go and say: "Here it is. Here’s my code, I’m learning". Let it roll.