P.O. Toolbox 1.4.1, from IntelliInnovations, is an application for managing all aspects of shipping packages via the US Postal Service, from rate calculations to package tracking and confirmation. The new version adds support for generating Delivery Confirmation barcodes. P.O. Toolbox is available for Mac OS 8/9 and Mac OS X and costs US$99.95; a CD is $10 more.