Tomi Valkeinen has implemented continuations for the Mono virtual machine.
His continuations work is here.
Most of his tests are used for a user-level thread implementation he calls Microthreads.
This looks like a very nice addition, and Paolo seems to like it too. In the past I abused C# iterators to get some of the benefits of continuations in Mono's ASP.NET (the HTTP processing pipeline).
Posted on 19 Apr 2006