Oracle SQL Developer 3.0 Early Adopter 1 is now available for Download.
We can check New Features and watch the online demonstrations (DBMS Scheduler, Database Navigator and Query Builder)
After Installed I interest "DBA navigator":
I think It's great. I hope someone test and share ^ ^
Read other blog: Kris' blog
Testing aggregate navigation on OBIEE and Exalytics
13 hours ago