CSS Positioning @ w3schools

Learn CSS Positioning in Ten Steps

CSS Positioning @ BrainJar

Flexible Layouts with CSS Positioning

Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification

Integrated Web Design: Position This! CSS Positioning Demystified

Stopping the CSS positioning panic (Part 1)

Miscellaneous

Custom 404 with jQuery and jQuery UI

Tutorial: From PHP to XML to jQuery and Ajax

Using jQuery and Ajax To Create PHP Sessions

From MySQL to jQuery, via PHP, XML & Ajax