This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
400 series and 500 series are easy to remember as they refer to client side and server side error respectively. 200 for success and 100 for information. When it comes to 300, its above the resources that moved permanently or temporarily. That's how Just kidding. I memorized them.