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.
There is not much difference between WL7 and WL8 except new things like weblogic workshop. So you can still prepare for WL7 exam with a WL8 book. Anyway, the best material is BEA's Study Guide than any other book.