I think we're pretty much out in the cold.
The CodePlex toolkit is a complete nightmare, according to pretty much everybody who's tried to use it. The current state is that they've released a 2.0 version that isn't backward compatible to the old stuff and doesn't support the latest Facebook API changes. The old versions (1.7 and lower) are no longer supported and now broken with the latest API. The new version is buggy and incomplete, has been effectively abandoned by the developer, and is also incompatible with the latest API. And every version of it that I'm aware of is 3.5 only, which means you can't yet put it into production.
In short, It's pretty much the worst case scenario. Until somebody steps up and puts out a working library, you're better off rolling your own thing. I'm personally basing mine off of the facebook-c-sharp library, which is lightweight and basically works. It's winforms-only, so you'll need to tear pretty much everything out and just use the REST wrappers, but it will save a bunch of work getting started.