Google and Microsoft Contribute to the Same Open Source Project
by Todd Ogasawara
Redmond Among Contributors to Open Source PHP Framework
...about contributers to the Zend Framework. Among the many (400) contributers to the project are Google and Microsoft. It's probably just me, but I found it amusing (in a good way) that the two arch-rivals contributed pieces to the same Open Source project.
The article goes on to describe how Microsoft sponsored work to enable InfoCard (now called CardSpace) support in a number of Open Source products including Zend and Ruby on Rails.
I don't think this is anything new.