Just came across this when doing a search. What kind of coding are you interested in?

If you're interested in learning web development, I wanted to throw it out there that I just recently published my first book, Your First Web App, that teaches you all of the core concepts of web development and walks you through the creation of an entire web app, from start to finish.

You can see more info here:

http://www.alexpcoleman.com/your-first-web-app/

Also, I'm currently running a free 10 week email course on web development called Summer of Coding. It's already started, but if you can still sign up and follow along. When you sign up, you'll automatically be sent links to the first two lessons, which have already been released. Here's the page to signup:

http://www.alexpcoleman.com/summer-of-coding/

And as for other physical books, I've always been a big fan of O'Reilly's "Head First" series. They present topics in a fun, but informational way, and there are books in that series on all kinds of coding topics.

Hope that helps!

Since it's self-qualified, it's also just entirely arbitrary. Who are you, or I, to say that you/we're 100% skilled at CSS? It'd be much more helpful to give a quick list of what you're capable of doing in that area (e.g. can translate design files to CSS3; build custom WP themes, etc.).