Developer buyolympia.com has published
SwordfishExpress 2, which is billed as the only Mac OS X application authorized to print U.S. Postal Service (USPS) postage on your computer. The new version adds more mail classes, postal rate auto-calculation, XML and AppleScript automation, integration with Address Book and more. You can use SwordfishExpress 2 for US$19.95 per month, with a 30-day free trial at the beginning. System requirements call for Mac OS X v10.2.7 or higher, 128MB RAM, 16MB free hard drive space and an active Internet connection.