Website make-over

I took the advantage of a free Sunday and changed the design of my website, which stood on my to-do list for a long time. I thought that the old layout was to confusing and and not intuitive enough to find things quickly. I reduced the navigation and the content. And I turned back to a vertical navigation (in desktop-mode), which makes more sense on a widescreen monitor. I'm not feeling comfortable with on-top horizontal navigation-bars, I think they always hide too much of a website. 

I hope you like the changes. Since no one is perfect, just tell me if you find any error.