Okay i can't really call this a tut but in a way it is.
I've had a few people ask me for help with there website, It tends to get really annoying. So ive taken time to find a few links
HTML, XML & CSS
http://www.lissaexplains.com/
Html help and tutorials "for kids" but this site is well written and provides a definitive guide for any beginner.
http://www.alistapart.com/
Really nicely done articles and tutorials on various stuff including (x)html, css, good design practice and scripting.
http://www.cssplay.co.uk/
Everything to do with Css, including pure Css dropdown menus.
http://www.w3schools.com/
Lots of tutorials and info on everything from basic Html to advanced scripting.
http://style-sheet.info/
Interactive style sheet examples. - This is quite fun hehe
http://www.webmonkey.com/
A huge collection of Html, Css Javascript, Php, and lots-of-other-stuff tutorials.
Online Editors
http://htmledit.squarefree.com/
Html Edit Here, you can write your Html in the box, click the button and see the results instantly.
Javascript Help / Free Codes
http://www.dynamicdrive.com/
Free DHTML & Javascripts.
http://javascript.internet.com/
Large library of free Javascripts and Ajax.
http://www.javascriptkit.com/
Free Javascripts & Java applets. DHTML, Css & web building tutorials.
http://www.javascriptcity.com/
Free Javascripts & tutorials.
http://www.hypergurl.com/easyhtml.html
Free Javascripts and generators.
PHP & MYSQL
http://www.tizag.com/phpT/
A wide variety of tutorials on Php, Javascript, Xml, Html & Css, Pearl and Ajax.
Others will be coming soon