As a lot of you know HTML5 has been out for awhile and its starting to show up in all sorts of tutorials, demos and blogs.  HTML5 adds a bunch of new elements and element attributes, new character encoding options and much more. If you wanted to take a look at the new specs and see the differences between HTML versions 4 and 5 click here: http://dev.w3.org/html5/html4-differences/Overview.html