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.
I donno about SCWCD Whiz labs simulator. But I tried SCJP Whiz labs simulator and it was really tougher than the real exam. Normally Whiz Labs will have lot of tough and brain teasing questions. As per my knowledge, it is the number one commercial simulator in the market