A new release had been published - WCF Contrib v2.1 Mar07.
This release is the final version of v2.1 Beta that was published on February 10th, you can check the entire updates made from v2.0 further in this post.
You can distinguish between this release and the v2.1 Beta Feb10 by checking the assembly file version, in this release it was incremented to v2.1.0.1.
Changes from v2.1 Feb10 Beta:
There is a one small change which is a breaking change for those who used the asynchronous invocation pattern using the "InvokeChannelAsync" or "InvokeAsync". (protected methods of ClientChannel)
This is a seldom used pattern so the chances of that affecting you are pretty minimal.
The change is very simple, instead of working with AsyncServiceInvokeCallback in these methods, it gets the general AsyncCallback which it then calls by passing it a ChannelInvokeAsyncResult which contains all the information needed.