Stefan Roock, program chair of this year's XP Days Germany, has just announced that the submission deadline has been extended till July, 27:
Since the open reviewing process has worked well, the program comitee will need less time for the final review.
He is definitely right that opening the review process to all was a big improvement. I have two submissions in the run: "Behaviour-Driven Development" and "Test-Driven Ajax". Go to http://www.conftool.com/xpdays2008/, register and tell me what you think of those.