www.smashingmagazine.com is one of the best places I have ever visited about CSS, xHTML, Photoshop, Form Designing and all other Web Designing. If you get a chance just go through their website. They have simply amazing tutorials.
Top 10 CSS Table Designs
http://www.smashingmagazine.com/2008/08/13/top-10-css-table-designs/
How to page
http://www.smashingmagazine.com/category/know-how/
80+ AJAX-Solutions For Professional Coding [Simply Amazing]
http://www.smashingmagazine.com/2007/06/20/ajax-javascript-solutions-for-professional-coding/
