My style of tutorials may be a bit different to the normal teaching style where they go through everything, I believe that's what books are for (they have the publisher to check and the space to go through everything). So most of the time I'll recommend a book (the one that I used) that can be used to fill in the gaps.
So I'll just provide a very basic introduction and mention some important things to note. Then I'll provide some examples and ways of doing things, essentially a cookbook approach of teaching.
XHTML/HTML doesn't need to be this scary thing that most people paint it to be. Its quite simple, especially when combined with CSS. Here I'll just provide a basic introduction and some of my thoughts.
I don't think that there's much of interest here as I still stand by that XHTML is really basic (its meant to be). Just a reference of sorts which I sometimes use (not so much anymore).
Busy working on css, not very far and will probably stay that way since I'm busy with other work right now
PHP and Python have also crossed my mind but I think that those are too big for me to cover