1) SQL Developer 3.0 was release on Tuesday. Some of the major new/revamped things include migration from Sybase, Data Miner, Spatial, and Scheduler. There's a longer list of new things we added which can be read here. If you have not already, it's downloadable here.
2) OTN Developer Days in Toronto. We had a great crowd in Toronto. Chicago is the next stop on April 25th registration is here . This is a great way to talk with people from development. We have folks from TimesTen, XML, Java, PHP, Jdev, and .NET all at the event.
3) Rounding out the week. Oracle XE 11.2 Beta. After a long wait, it's finally arrived. It can be downloaded here . The documentation can be found here. There is a dedicated forum here for any questions or issues you may find.