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I think it's missing footer
And I would recommend some readings about semantic markup, because it is very important for a skin that tends to be an example of good coding and SEO. Here are useful articles:

• Integrated Web Design: The Meaning of Semantics
• Semantics, HTML, XHTML, and Structure
• The Definitive Guide to Semantic Web Markup for Blogs
• BBC Future Media Standards & Guidelines - Semantic Mark-up