Layout Without Tables  mileage will vary on these concepts
Evolt.org - The Wrong Way to Use It read this first
Glish.com  nice column article, tutorials & more
— layout hacks - 3 cols, the holy grail
BlueRobot.com  layout demos
TheNoodleIncident.com  box lessons
— layout demos
— layout workarounds
Floating Box Layout  extensive instructions
Box Layout step by step example of a fully scalable layout
Experimental Demos nice css pointers group demo with screen shots of them done right
MSDN DIV Properties list
Advanced css layout  part of a challenge to replicate webreference.com in css only
Real world table free site development  code for delivering separate .css and resources
Introduction to CSS Layout  dissects a developer.apple.com page
AListApart.com - Practical CSS Layout
— liquid layouts with negative margins
RealWorldStyle.com layout examples even for  n4 
— 3 col + footer n4 also
— organize your styles
DenisWilford.com - Look Ma No Tables
Scott.Sauyet.name - Footer
ProjectSeven.com - Graffiti
Nemisis Project resources templates +
— their template
DenisWilford.com - Tutorial
MaxDesign.com.au - Tables to Full Css Case Study
— 2 & 3 column templates
Meryl.net - Css Tableless Sites LInks

 Positioning or CSSP 
W3C Visual Formatting Model
StyleMaster Positioning Tutorial
WebReference.com - CSS Positioning Pt 1 - Pt 2
AlistApart.com - Flexible Layout with Positioning
Fixing Frames with CSS Positioning
Developer.Netscape.com - CSS Syntax Wizard cssp code generator
Brainjar.com - CSS Positioning
Multiple <divs> with z-index set  one with form should be bottom - some browsers will put it top
Collected Newsgroup Clips  assorted wisdom

 Opinions Pro & Con 
HotDesign.com - Seybold Presentation Why tables for layout is stupid
DeCloak.com - Tables vs Fully Css Exagerated/Wrong but does have some valid points