Consider These Layouts (for the mail panel side):

• Most room for your message
• Best positioning for your message
• Getting the lowest automation rate for a post card

A mailing including at least 500 automation compatible post cards qualifies for automation rates that average $0.22 (post May 12, 2008 price) if the postcard is within the USPS "Card" dimensions. These are attractive postage rates compared to the average $0.36 cost for a larger "Letter Sized" post card. And first class gets your message out quickly... between 1-3 days across the US.