This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
When I looked into this about 6 months ago there was no Oracle 11g for OS X. I ended up running a VirtualBox virtual machine loaded with a suite of Oracle tools and DB. It was fine for playing around with.