The schedule builder application for Oracle OpenWorld and Oracle Develop is up and running.
One good reason to use this tool and use it early is to make sure you get into the sessions and hands-on labs you are interested in.
Last year we had multiple hands-on labs and several sessions that ran out of space in the room - in these cases entrance into the sessions is limited to people who pre-registered to them through the session builder tool.
So I would recommend that if you already know of specific sessions you want to be in - go into the schedule builder and add them to your schedule as soon as you can.
This also gives us at Oracle a bit more feedback on which sessions are more popular and in some cases allows us enough time to move popular sessions to bigger rooms and sometime event offer a re-run of a session.