First of all thanks for creating the toolkit. It seems of great use for a project I'm working on.
I have one suggestion though. Currently, the main "Facebook" project depends on the System.Web assembly for certain aspects such as URL encoding. This prevents the Facebook assembly from being deployed with the Client Profile .NET framework subset.
It would be great if the code can be refactored in a way that removes these dependencies.
I hope this can be taken into consideration,