We are happy to announce the availability of Magento version 1.2.1 for download and upgrade.
This version includes some issue resolutions for Magento version 1.2.x. A full list of items included in this release can be found on the release notes page.
Diff files for the latest version can be found here.
Note: We do NOT recommend upgrading a production installation of Magento directly. Please backup database and all files before upgrading. Please make sure to check file permission before trying to upgrade through your Magento Connect Manager.