The Experimental Aircraft Association, Inc. announced that,
"Ten classic American aircraft from the 1930’s, ‘40s and ‘50s take to the skies in the form of postage when the U.S. Postal Service dedicates the American Advances in Aviation commemorative stamp sheet at the world’s premier air show, EAA AirVenture Oshkosh 2005."
"The stamps will be available at Post Offices and Philatelic Centers nationwide on Saturday, July 30." Also, "Six of the aircraft stamps will be in the form of limited edition prints measuring 12 3/4 x 13 3/4 inch. They’ll only be available on the grounds at EAA AirVenture Oshkosh 2005."
I'll be at the Post Office on the 30th to get my stamps!
Addendum: See the U.S. Post Office site for detailed information about these stamps, and related offerings.