WPF 3.5 SP1 sources are now available!
The Reference Source Code Center team has just announced that the WPF 3.5 SP1 sources are now publicly available. You can read about it here, http://blogs.msdn.com/rscc/archive/2008/10/22/wpf-sources-for-net-framework-3-5-sp1-are-available.aspx. The post also has pointers on how to setup and where to post any issues or feedback. Enjoy!