Please read about another event that we'd normally participate in (this year posed a small conflict with the Dixie Zone championships).
Article provided by Scott Bay, thanks!
It's a great event! USMS also hosts several other long distance postal events each year. In Sept. - Nov. they have the USMS 3000/6000 Yard Postal Championships (25 yard pools only) and in May - Sept they have the USMS 5 and 10 Kilometer Postal Championships (50 meter pools only).
For more info check out: http://www.usms.org/longdist/ldnats06/