I’m really happy to announce the release of the second CTP for version 2 of the Open XML SDK ! Back in October 2008 I showed you guys an architecture diagram of the Open XML SDK. Let’s take another look at this diagram: In version 1 of the Open XML SDK we released the Open XML Packaging API, which allows you to create, open and manipulate Open XML files at the package and part level. In the first CTP of version 2 we released the Open XML Low Level DOM and Stream Reading/Writing components, which allow you to create and manipulate objects within xml parts contained in an Open XML package.
Read more here:
Announcing the Release of the Open XML SDK Version 2 April 2009 CTP