This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Also, I understand that the OCPJP 7 exam is now available. You may want to consider getting the Java 7 certificate as long as you are paying for an upgrade.
I've decided to take the Java 6 exam -- not the Java 7 exam. The Java 7 exam sounds like a lot of changes to me and the study guides and practice exams probably aren't available yet since the Java 7 exam is just coming out.