This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Unlike many other certifications, once certified, you are always certified for that particular version of Java. So for example, if you have passed 1.4 certification, it is valid for ever, even after 1.5 is released. Of course, with due course of time, it will become obsolete (but still valid)