You can download the free production release JDeveloper Release 3 (10.1.3) from here, featuring tons of new features in every area of the product. There are links here to lots of new resources like online demos and tutorials, too. The first of two planned ADF Developer's Guides is available immediately, along with a new sample application.
For developers focusing on maximally-declarative development with Oracle ADF and ADF Business Components, while we're still working on the ADF Developer's Guide for Forms/4GL Developers for delivery later this quarter, an early access version of the SRDemoSample ADF BC Version, an early access version of the ADF Toy Store "JSF Edition", and a brand new Oracle by Example tutorial Building a Web Application with ADF Business Components and JavaServer Faces are available now.
We'll be monitoring the OTN JDeveloper Discussion Forum for questions regarding the new release and these many new resources.