1. You can now upload your presentation files using the PyCon Schedule App. Log in to your site account. Locate your talk, hover over the title, wait a second or two while the data loads, then click the "Upload File" link in the pop-up that appears.
2. There are Tips for Speakers posted on the site. (Yes, it's a bit late for this, but maybe some of the tips will help ease presenter stage fright.)
Good luck with your talks. See you at PyCon!