If you have one or more websites written in XHTML 1.0, this program (which may be downloaded and used free of charge) lets you convert them to HTML5 without having to muck around with rewriting HTML and adding CSS.

This guide takes you through the process of converting a website from XHTML 1.0 to HTML5 using the Fiverizer software. (Fiverizer is a program that I wrote to convert my own websites, all of which were also in XHTML 1.0. It may be downloaded and used free of charge.)