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.
I just went to download JDK 1.5 for an installation of JetSpeed2, and was surprised that it wasn't immediately there at Suns site.
I don't think you'll see an SCJA exam on Java 6 for quite a while. SCJA is realy more concerned with high level Java concepts, as opposed to the intricate details about how the various different versions work. Master the high level stuff, and the basics of Java syntax, such as looping, initiaization, and conditional statements, and you really shouldn't have to worry about the differing versions.