So, I am just getting to grips with CSS design, and have a simple site design up:
Hi accelerator. Doesn't look too bad. Personally, I would save the <h1> for the content title, and use some plain text / image for the logo, as the main page topci should be in the <h1>.
You don't need the div around the menu, as the <ul> is a block element anyway.
You always need to test your work in all browsers to be sure there's nothing wrong with it.