http://www.psyclops.com/tools/rgb/ RGB to Hex converter
http://webdesign.about.com/od/colorcharts/l/bl_rgb2hex.htm RGB to Hex converter
http://htmlhelp.com/reference/css/color-background/ CSS background property
http://www.1keydata.com/css-tutorial/background.php CSS background property
http://css-tricks.com/nine-techniques-for-css-image-replacement/ List of Image Replacement techniques
http://css-discuss.incutio.com/?page=ImageReplacement See IMAGE REPLACEMENT; also a good general reference for positioning
http://www.mezzoblue.com/tests/revised-image-replacement/ List of Image Replacement techniques
http://www.sitepoint.com/article/image-replacement-state-scope/ Image Replacement technique using a little JS
http://particletree.com/features/css-rules-for-image-replacement/ Image Replacement technique also using a little JS
http://www.1keydata.com/css-tutorial/border.php Basics of using the border element
http://css.maxdesign.com.au/selectutorial/Select Tutorial
http://www.brainjar.com/css/using/ Overview of CSS Style Sheets; including review of selectors
http://www.eskimo.com/~bloo/indexdot/css/syntax/selectors/selectors.htm Complete list of Selectors
http://www.smashingmagazine.com/2008/10/07/retro-and-vintage-in-modern-web-design/ CSS Smashing Magazine article on Retro design; also in PDF in class handouts. Reference for the Retro project
http://www.smashingmagazine.com/2008/10/14/30-beautiful-vintageretro-photoshop-tutorials/ How to create retro looks in Photoshop
http://www.smashingmagazine.com/2008/10/26/retro-and-vintage-typography-showcase/ How to create retro looks using Typography
http://www.smashingmagazine.com/2008/01/29/grunge-style-in-modern-web-design/ How to create grunge design looks, part I
http://www.smashingmagazine.com/2008/03/11/the-secrets-of-grunge-design/ How to create grunge design looks
http://www.smashingmagazine.com/2008/10/23/50-beautiful-blog-designs/ Blog design
http://www.smashingmagazine.com/2008/07/09/textures-and-patterns-design-showcase/ Textures and pattern repeats
http://psdtuts.com/category/tutorials/ Tutorials, including for Grunge and 80's retro; also see 'Freebees' section for textured patterns
Also see 'tutorials' on Smashing Magazine for special tutorials on grunge, retro, textures and pattern effects
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/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://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