CSS Tips and Tags

Selectutorial
http://css.maxdesign.com.au/selectutorial/
This link takes you to a wonderful tutorial on CSS selectors at Australia's Max Design Web site.

W3C Selectors
http://www.w3.org/TR/CSS21/selector.html
This is the official W3C page on CSS style rule selectors.

XHTML Reference
http://xhtml.com/en/xhtml/reference/
Here's a quick reference of XHTML tags.

CSS 2.1 Selectors
http://www.456bereastreet.com/archive/200509/css_21_selectors_part_1/
This is a good tutorial on CSS selectors.

Use Class With Semantics in Mind
http://www.w3.org/QA/Tips/goodclassnames
Click the link above for some excellent advice on naming style classes, straight from the folks who brought you CSS.

Span and Div
http://en.wikipedia.org/wiki/Span_and_div
This is a quick encyclopedia description of the "span" and "div" tags.

CSS Shorthand Properties
http://mezzoblue.com/css/cribsheet/
Here you'll find some good general tips and techniques for getting the most from CSS.

CSS Tips and Tricks, Part 1
http://www.456bereastreet.com/archive/200503/css_tips_and_tricks_part_1/
Here is a page of good general CSS tips and tricks. You'll find the link to Part 2 under "To be continued" at the end of the article.

Web Development Mistakes, Redux
http://www.456bereastreet.com/archive/200408/web_development_mistakes_redux/
As the title implies, this site covers the most common Web development mistakes and how to avoid them.