There have been a number of improvements to the DB Manger tool:
In the DB Manager you can now export your data to any OGR supported data format instead of the Shapefile only that was available in the previous version.
Oracle Spatial is now supported in the DBManager
When importing data into a table you can use the new import only selected features option to restrict what will be imported.
New query windows are now created as tabs to reduce the number of dialogs
Click the image to open original size image in new tab