If you are using Magento for your website and ship via USPS, you will want to read this. USPS is changing the names of a few shipping options in their API. You will need to apply a patch to ensure that USPS Priority and Express mail continue to work after July 28th 2013.
Patch Needed to Address USPS Shipping Option Name Changes
On Sunday, July 28, the United States Postal Service rolled out changes to their API that impact Priority and Express mail shipping options. USPS is changing the name of these two shipping methods and their Webtools API was updated to match those changes.To continue utilizing USPS Priority AND Express mail methods, merchants on Magento solutions must install the patches we’ve created to address the issue, and we have included patches for all versions of Magento Community Edition and installation instructions in this post.