The USPS took the opportunity to reveal their newest stamp at the National Stationery Show in New York recently.
The newcomer, a 64-cent Butterfly Stamp, was introduced for use with square cards, envelopes and other irregular shaped mailers.
To learn more about the stamp and its use, visit:
http://www.postalreporternews.net/2010/05/17/usps-issues-new-butterfly-stamp-for-irregular-shaped-greeting-cards/