Developer Cheat Sheets

Databases:

MySQL Cheat Sheet
MySQL Reference List
SQL Server Cheat Sheet
SQL Server 2005 Commands

Programming:

ASP/VBScript Cheat Sheet
C# Language Reference
C# Programmer’s Reference Sheet
.NET Cheat Sheets
PHP Cheat Sheet
PHP Developer Cheat Sheet
Ruby Cheat Sheet (PDF)
VB.NET Cheat Sheet (PDF)

Web Dev:

CSS Cheat Sheet
CSS [continue reading...]