Code on github is undeniably good advice. Anything. It's like having an online portfolio if you're a designer.
Also, we like people with interesting pet projects. It helps us easily get a sense of what kind of engineer you are.
(ObPlug: Tasty Labs is hiring. http://www.tastylabs.com/)
For example, I have a project I did in 6 hours, so I know it's not the best code I could write. However, I think it's great to share what you've got. As Seth Godin would say, ship it.