Cheat Sheets are handle for web development. Usually, these sheets are either printed out and pasted on the wall of your working area or they are placed on your computer as wallpaper. Referencing in this way makes working faster and more effective. Here are a complete list usually used by most designers and developers during web development. Enjoy!

1. Programmers

HTML Cheatsheet

HTML Entities References

HHTML/XHTML Character Entities

XHTML Character Entity Reference

HTML 5 Cheat Sheet (Updated 7 July 2009)

ASCII Character Codes Table & Cheat Sheet

PHP 5 Cheat Sheet

PHP Cheat Sheet (V1)

PHP Cheat Sheet (V2)

PHP Reference Sheet

PHPQuickReference Widget

note: Mac OS only.

Seess (CSS v1,2,3 widget)

note: Mac OS only.

CSS Blueprint

CSS Cheat sheet

CSS Shorthand Cheat Sheet

CSS Shorthand Cheat Sheet

Regular Expressions Cheat Sheet

JavaScript and Browser Object Quick References

JavaScript Reference

2. Open Source

jQuery 1.2 Cheat Sheet

jQuery Visual Map

jQuery v1.2 Cheat Sheet

MooTools v1.2 Cheat Sheet

jQuery v1.3 Cheat Sheet

jQuery v1.3.2 Cheat Sheet

jQuery v1.3 Wallpaper

Prototype Cheat Sheet (v1.6.2)

Prototype (v1.5.0)

WordPress Help Sheet

WordPress SEO Cheatsheet (Updated 29 June 2009)

Advance WordPress Cheatsheet  (Updated 29 June 2009)

Drupal 6

Jooml 1.5 Basic Template Cheat Sheet

Magento Events Cheat Sheet

3. Designers

Adobe Pen Tool Cheat Sheet

Adobe Brush Tool Cheat Sheet

Adobe Lasso Tool Cheat Sheet

Photoshop Quick Reference Sheet

Photoshop Secret Shortcuts

Adobe Illustrator Shortcuts

Photoshop Keyboard Shortcut (CS, CS2, CS3, CS4, etc.)

Illustrator CS3 Keyboard Shortcuts

Mac: Illustrator CS3 Keyboard Shotcuts

Windows: Illustrator CS3 Keyboard Shotcuts

Illustrator CS2 Keyboard Shortcuts

Mac: Illustrator CS2 Keyboard Shortcuts

Windows: Illustrator CS2 Keyboard Shortcuts

Dreamweaver CS3 Keyboard Shortcuts

Mac: Dreamweaver CS3 Keyboard Shortcuts

Windows: Dreamweaver CS3 Keyboard Shortcuts

Other Adobe Keyboard Shortcuts

Mac:

• InDesign CS2 Keyboard Shortcuts
• InDesign CS3 Keyboard Shortcuts
• InDesign CS4 Keyboard Shortcuts
• Illustrator CS2 Keyboard Shortcuts
• Illustrator CS3 Keyboard Shortcuts
• Illustrator CS4 Keyboard Shortcuts
• Dreamweaver CS3 Keyboard Shortcuts
• Dreamweaver CS4 Keyboard Shortcuts

Windows:

• InDesign CS2 Keyboard Shortcuts
• InDesign CS3 Keyboard Shortcuts
• InDesign CS4 Keyboard Shortcuts
• Illustrator CS2 Keyboard Shortcuts
• Illustrator CS3 Keyboard Shortcuts
• Illustrator CS4 Keyboard Shortcuts
• Dreamweaver CS3 Keyboard Shortcuts
• Dreamweaver CS4 Keyboard Shortcuts

Black & White Cheatsheet For Photoshop

Photoshop CS3 Training Reference Sheet

Fireworks CS3 Training Reference Sheet

Paper Size

Standard Web Banners Size

Commercial Envelopes

InDesign Cheat Sheet

Photoshop Toolbox Reference

Adobe Photoshop Element's Organizer Cheat Sheet

Font Card

Web Safe Font

Web Safe Color Chart

Browser Safe Color Chart

Color Hexagon

Color Reference Guide

4. Others

SEO Web Developer Cheat Sheet

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CheatSheet.org

Note: Most cheatsheets can be found in here. Great stuff!

gotAPI

DZone Refcards ( For Developers )

Further Udate

These updates are from 02 August 2009 onwards. Not much images available after the initial release but the resources are still pretty gathered.

• Ajax Cheat Sheet
• Prototype Dissected Cheat Sheet
• XSL FO Reference
• XML Schema – Structures Quick Reference
• XML Schema – Data Types Quick Reference
• XML Quick References
• W3C DOM Compatibility Tables
• Browser Compatibility Interactive Table
• Scriptaculous Combination Effects Cheat Sheet
• Scriptaculous Cheat Sheet
• AJAX for ASP.net Cheat Sheet
• MySQL Reference Sheet
• SQL Injection Cheat Sheet
• Ultimate IE6 Cheatsheet: How To Fix 25+ Internet Explorer 6 Bugs