Oracle SQL Developer Release 3.0 - Early Adopter 1
Release Notes

http://www.oracle.com/technetwork/developer-tools/sql-developer/rel3-ea1-relnotes-166829.html

New Features in SQL Developer 3.0

Oracle SQL Developer 3.0 introduces the following key functionality:

Database Navigator: More database functionality is introduced into the product. Users can now manage Database Configuration files, Resource consumption, Security for profiles, roles and users, and manage Storage files such as control files, datafiles, archive and redo logs, rollback segments and tablespaces.
DBMS Scheduler: The Scheduler enables you to control when and where various computing tasks take place in the enterprise environment. The Scheduler helps you effectively manage and plan these tasks. Scheduler objects include: programs, schedules, jobs and job classes, destinations, chains and credentials are now added to the Connections Navigator. A graphical editor called the Scheduler Design Editor can be used to create and run scheduler objects.
SQL Tuning: SQL Tuning Advisor analyzes high-volume SQL statement and offers tuning recommendations. A Diff Tool for Explain Plans compares selected Explain Plan or Autotrace results for any SQL statements.
Query Builder: Visual SQL Query Builder with an object drag and drop feature from the connection navigator to the Query Builder view. SQL Worksheet and Query Builder view are tightly integrated. Switch between Worksheet (text) and Query Builder (visual) views at any time.
Spatial Data Management: Spatial Data Management provides a SQL schema and functions that facilitate the storage, retrieval, update, and query of collections of spatial features in an Oracle database.
Schema Browser: The Schema Browser supports fast client-side name based filtering for narrowing the list of objects displayed.