Google turns out to be your best friend whenever you need to learn something new and it’s the case pretty much always when you need to find some tutorials on various Content Management Systems and other similar stuff. I recently stumbled into a wiki which could be a nice resource if you are looking for comprehensive tutorials on designing web themes and templates on a wide range of Content Management Systems and related software.
Some of the better tutorial wikis on this site called Themeswiki are “customizing drupal 6 themes,””creating php templates,” and “creating joomla templates” etc. If you are into tweaking and messing with code then you would definitely find something of interest. Just thought you might like it.