Some nice new features in Tiger
My favourite is:
Your Very Own iChat and Blog Servers
You can now host your own iChat server. Instant Messaging serves as a vital means of communication for organizations of all sizes, so it’s useful to deploy and run your own private and secure IM server. Based on the open source Jabber project, the new iChat server in Tiger Server lets your company protect its internal communications by defining its own namespace, using SSL/TLS encryption to ensure privacy, and Kerboros for authorization. The iChat server works with both the iChat client in Mac OS X Tiger and popular open source clients available for Windows, Linux and even PDAs.
A new Weblog server in Tiger Server makes it easy to publish, distribute and syndicate web-based content. The Weblog server provides users with calendar-based navigation and customizable themes, is fully compatible with Safari RSS and enables posting entries using built-in web-based functionality or with weblog clients that support XML-RPC or the ATOM API. The Weblog Server, based on the popular open source project “Blojsom,” works with Open Directory for user accounts and authentication.