On the same date as Tony's post I sent a list of prime numbers where the three dates of this Labor Day weekend pass through the center of what I call the 'Prime Cross'. Curious coincidence.
 
Link to Tony's post: http://www.fivedoves.com/letters/aug2006/tonye821-3.htm
 
Link to my post: http://www.fivedoves.com/letters/aug2006/bobware821-2.htm