I have made a document on making the move from HTML 4 to XHTML. While this is nothing spectacular or anything brain busting, it should help some.

Due to the extensive quotes from different articles in the document, this may or may not be appropriate as a tutorial as 100% my own. However, I did reference anything I have gotten ideas for. Therefore, I placed it away from the tutorials section.

If it does qualify, then you can move it. Otherwise, it does not matter.