Applied Patch: SUPEE-1533 - Addresses two potential remote code execution exploits
Applied Patch: SUPEE-4291/4334 - This patch addresses the USPS API changes that went effective on Sep. 7th
SUPEE-3941 - Addresses extension-related issues
SUPEE-3762 - Prevents repeated SOAP index page call issue from causing customers to only see the Magento installation page