Zen Cart has been upgraded to version 1.5.1. Version 1.5 had been the most current version so this is a minor upgrade. For those of you running version 1.5 (What version of Zen Cart do I have?), I would strongly suggest upgrading. There are some minor improvements and a number of bug fixes. The reason to upgrade is not for added security.
The reason to upgrade is that keeping current in these small steps is easier and less expensive in the long run than doing a few larger upgrades. If you are interested in upgrading, we are currently running special (expires 9/30) for upgrading to Zen Cart 1.5.1 from version 1.5.