I almost missed this one. Plone 2.5.2 was released a few days ago. Plone is a CMS written in Python (something I know a lot about) that is built on the Zope application server (something I know very little about). The Plone 2.5.2 release is a bug fixer for the following:
- Unicode handling
- External Editor
- IE7 rendering
The original announcement from Plone.org can be read here.