http://sixrevisions.com/resources/cheat_sheets_web_developer/
HTML/XHTML
1. HTML Help Sheet
2. HTML Cheat Sheet
3. HTML Character Entities Cheat Sheet
4. XHTML Cheat Sheet v. 1.03 – PDF
CSS
5. CSS Cheat Sheet (V2)
6. CSS Cheat Sheet
7. CSS Shorthand Cheat Sheet
8. CSS Level 1 Quick Reference – PDF
9. CSS Level 2 Quick Reference – PDF
10. CSS2.1 Quick Reference Card – PDF
11. CSS2 Reference Guide – PDF
JavaScript
12. JavaScript Cheat Sheet
13. Addison-Wesley’s JavaScript Reference Card – PDF
14. JavaScript and Browser Objects Quick Reference
15. The most common DOM methods at a glance – PDF
16. JavaScript Quick Reference Card/Cheatsheet
17. mootools 1.2 cheat sheet
18. jQuery Cheatsheet
19. jQuery 1.2 Cheat Sheet
20. jQuery Visual Map – PNG
Miscellaneous
21. RGB Hex Colour Chart
22. The Web Developer’s SEO Cheat Sheet
23. The WordPress Help Sheet
