Has anyone found any documentation showing how the MSBuild framework has changed from Beta 1 to Beta 2 (or the Feb CTP) ?

All the documentation I can find is focused on the Beta 1 version.  I am tring to build an XML Logger to use with CruiseControl.NET.  I have found several examples but none of them compile under the Feb CTP and after much work (and frustration) I can't find equivalents of several classes in the new framework.

If anyone has started working with this, let me know and I will publish my results and code after I code this to the new framework.  Thanks!