HTML5 reference sites
http://www.w3schools.com/
http://www.codecademy.com/
http://caniuse.com/
http://media.mediatemple.netdna-cdn.com/wp-content/uploads/images/html5-cheat-sheet/html5-cheat-sheet.pdf
http://html5doctor.com/
http://www.codeschool.com/
http://stackoverflow.com/
http://www.theodinproject.com/