If you wish to develop your skill as an SEO(Search Engine Optimizer), Seobook is a great website to learn from.
It is an extremely good resource and once you have the skill sets of an SEO, you may start working as a freelancer or apply it on your own website for better results.
I'm totally going to have to check that out. I've been looking for a great place that I can learn some SEO and I think that would be a good place to start.