I'm now a member of the CodePlex workspace for the Facebook Developer Toolkit. I've been working on porting across my modifications into the codebase. The .NETCF v2.0 version uses a project called Facebook.Compact but refers to the existing source files from the desktop project. Then some conditional compilation is used to hide a few unsupported features from .NETCF and implement some workarounds for missing functionality. This will be a familiar technique if you've been to Daniel's sessions (or read his blog posts on the subject). It's not quite working yet since my code made use of a couple of my own libraries for speed, so I'll need to implement a few of the features within those in the Facebook.Compact project.