I've had quite a bit of people ask me how to do HTML, but since I can't sit down with everyone, I've gathered a couple of links that will help you get on with your HTML journey.
Web Monkey: http://www.webmonkey.com
Web Monkey is a great website with a lot of tutorials over HTML and much more.
HTML Goodies: http://www.htmlgoodies.com/
Though this website's cluttered look may be intimidating, many of the tutorials are pretty good.
HTML Code Tutorial: http://www.htmlcodetutorial.com/
This website gives you a reference to all of the HTML tags.
I hope this gives everyone a starting place on how they can use HTML in order to change up their blogs. Also, if you are interested in tutorials over Photoshop, Flash, and more, then check out Spoono.
Spoono is also another great tutorial website, but you won't find much on HTML. There are a lot of other tutorials for flash and Photoshop though.