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've been looking at this also. It seems 1.4 is definately the way to go -- not only because it's more current, but because studying the 1.4 material will make you a better programmer in the long run. I'm talking about stuff like Collections, etc.