How come I haven't heard anywhere that freshly open sourced Apple Calendar Server is written in... Python.

The DAV based service is built on top of the Twisted framework. Good to see that for Apple : language matters. First they dropped the Cocoa-Java bridge to favor Objective-C and now they release some really cool stuff developed in a high-level, dynamic scripting language.

The lack of good open source calendaring solution was one of the main reasons even businesses heavily using free software were stuck with Outlook/Entourage and Exchange.

With Leopard, Apple is clearly aiming at Microsoft on both the home and business fronts. Chairs must be flying low in Redmond...