Apple recently released two updates to Snow Leopard Server: the Mac OS X Server v10.6.4 Update, a general package of reliability and security fixes as well as several new features, and Wiki Server Update 1.0, which comes as a separate installer.
An Apple Support Note details the changes in the v10.6.4 Update. Among the long list of fixes, the update adds Safari 5.0; improves reliability of Directory Services when Spotlight is enabled on the server; adds NetBoot/NetInstall model filters for new mid-2010 notebooks; and incorporates many improvements to the Wiki Service, such as iPad support for movies on wiki pages.
According to Apple, the Wiki Server Update 1.0 for Mac OS X Server v10.6.4 is recommended for servers running Mac OS X Server v10.6.4 build 10F569 or 10F2025. The improvements are included in the Combo Updater above.
Allows authentication by users who have high-bit characters in their full name. High-bit characters are "extended ASCII" characters such as ü or é. Allows access to wiki group calendars from the iCal application. Prevents wikis and blogs from becoming inaccessible after migrating from Leopard Server to Snow Leopard Server. Fixes an issue that could prevent the Wiki service from rebuilding its index (globalindex.db). Allows users to access wikis using a secondary shortname (alias). Shows private blogs to the blog owner.