Version 2.64 of Movable Type is now released. This is a maintenance release, fixing various CSS, XML-RPC, UI, and Creative Commons errors. This release also plugs a number of cross-site-scripting (script injection) holes for search queries, comments, TrackBacks, and notifications, and is recommended for anyone using any of these features. We have also improved the options for available RSS templates--in addition to the RSS 1.0 template that we have always provided, the default templates now include an RSS 2.0 template instead of a 0.91 template. Also in the default templates, this release fixes the rendering of the default stylesheet ("Clean") on Windows Internet Explorer. The full changelog lists the changes and fixes in 2.64.
If you hadn't yet upgraded to 2.6, see the Guide to Movable Type 2.6 for explanations of the above features, and for instructions on adding these features to your existing weblog if you are upgrading.