The OSCON 2004 site is live, so you can register; be sure to take advantage of the many discounts available. Also, don't forget to check the schedule for the Python 12 presentations and tutorials. OSCON is being held July 26 - 30 at the Portland Marriott Downtown in Portland, Oregon.
There is a plan to have sprints after the main conference is over, starting Friday afternoon and lasting through Monday morning, but the details haven't been worked out yet. If you are planning to attend OSCON and think you might be interested in doing some coding over the weekend, then you might want to hold off on finalizing your flights.