This week, I attended a "Sematic web technologies" course at the Open HPI University, where I learned new things about RDFa and Microdata. So I tried enriching my site and ended up with one of the "One day I will..." improvements planned for too long. The list of productions on the Atari 8-bit tab is now generated in PHP based on a simple CSV file. The resulting HTML contains all semantic information about the productions so search engines can use it. See what the Google Webmaster Tools can get out of this now.