NewBoston is a fantastic source, not just for HTML & CSS either, he has tutorials on Youtube as well as a very active and helpful forum for a ridiculous amount of languages and activities. Definitely worth checking out if someone looking to learn these things is reading this.

Also Code Academy is very geared towards Web Design / Web Development and is a great place to get your feet wet if you're clueless where to start out in: HTML, CSS, jQuery, JavaScript, Python, Ruby, PHP, and / or a few other things like APIs. I personally have over 700 points(1 point is awarded every thing you complete a short assignment / tutorial) on CA and still find some use out of it from time to time. :)