while trying to look up HTML/CSS references, I came across this interesting site full of webdesign cheatsheets : http://visibone.com.
The author, Bob Stein, has put some good webdesign reference information online like:
"The 216 color webmaster's palette"
"The world map with internet country codes"
"hexadecimal HTML color codes"
Color Lab Swatches Color Codes Color FAQ Color Wheel Color Blindness Popups Font Survey
The most important part however is that he has made cheatsheets in print form for easy reference to carry around with you. The rationale is stated like this:"It's not what you learn. It's what you remember."
NOTE: the site may appear amateur at first glance, but you'll find it's not, when you realize that colors and layouts are his forte, he probably knows best how to arrange those around the page.
So, if you have the liking for offline references, visibone is for you.
Also, you can vote for which cheatsheet he should work on next at his survey page:
Hope that helps,