Resources

W3C HTML Validator    Validate your HTML mark-up.

W3C CSS Validator    Valiate your CSS.

Search Engine Watch    Bring yourself up to speed on what's going on with search engines these days.

W3 Schools    Lots of information here.

Adobe's developer connection    Adobe's developer resource.

Position Is Everything    A site dedicated to informing you of bugs and anomalies with tableless layouts and how to overcome them.

Browsershots    Check your webpages in any browser under the sun...for free!

Lynda.com    A great resource for learning. It costs a little bit, but well worth it.