At http://CommemorateWTC.com there is a time capsule guestbook with the theme of "Where were you on 9/11?" It's only open today and tomorrow then gets sealed up again until next year. Just thought some people in here might be interested.
Hitch has a good article on why we shouldn't over do commerative 9-11 events. http://slate.msn.com/id/2088025/