http://www.glish.com/css/3.asp
http://blog.html.it/layoutgala/ Layout Gala
http://www.brainjar.com/css/positioning/ CSS positioning summary
http://www.dynamicdrive.com/style/layouts/category/C13/ Liquid layouts [note: these pages mix 'liquid/fluid' layouts which are %-based and 'elastic' layouts which are em-based]
http://www.smashingmagazine.com/2007/05/10/70-expert-ideas-for-better-css-coding/ Workflow and good practices
http://css.maxdesign.com.au/selectutorial/Select Tutorial
http://www.eskimo.com/~bloo/indexdot/css/syntax/selectors/element.htm Selectors
http://green-beast.com/blog/?p=199 Units of calculation in pixels, % and EMs
http://www.barelyfitz.com/screencast/html-training/css/positioning/ Tutorial on positioning
http://www.brainjar.com/css/using/ Overview of CSS Style Sheets; including review of selectors
http:/www.autisticcuckoo.net/archive.php?id=2005/01/11/block-vs-inline-1 Block vs. Inline elements [div vs. span]
http:/www.autisticcuckoo.net/archive.php?id=2005/01/12/block-vs-inline-2 Block vs. Inline elements: block formatting context, bloxk box dimensions, collapsing margins
http://www.autisticcuckoo.net/archive.php?id=2005/01/13/block-vs-inline-3 Block vs. inline boxes, inline box formatting
http://www.bigbaer.com/reference/colors/named_colors.htm Block vs. inline boxes, inline box formatting
http://www.htmldog.com/examples/ List of properties for HTML and CSS; look at LAYOUT examples. Also see IMAGE REPLACEMENT
http://www.glish.com/css/3.asp 3-column layouts
http://blog.html.it/layoutgala/LayoutGala07.html 3-column layouts
http://blog.html.it/layoutgala/LayoutGala33.html 2-column layouts
Xray tool for CSS analysis: http://www.westciv.com/xray/xray_more.html
http://css.maxdesign.com.au/floatutorial/ Float Tutorial
http://www.smashingmagazine.com/2007/05/01/css-float-theory-things-you-should-know/ Floats
http://www.quirksmode.org/css/clearing.html Floats and clearing
http://www.complexspiral.com/publications/containing-floats Containing floats