Serendipity (or sometimes called s9y) has a new release available with version 1.6. For those unfamiliar with Serendipity, it is a very powerful blog platform / content management system that offers tons of functionality. If you haven't had a chance to try it out, I'd strongly recommend you take a look at it as it's quite impressive.
Version 1.6 brings with it a host of new features and changes such as:
The current release can be easily installed on any previous Serendipity installation. Just unpack, upload and visit your admin panel to perform possible database upgrades. Upon first login with an old password, Serendipity will store your old password in the new format – please be sure to make a backup of your Database prior to upgrading.
You can download or learn more about Serendipity from their website, http://www.s9y.org/