Fibers in C#: are they faster than iterators, and have people used them?

Question

So I was chatting with a colleague about fibers and turned up this paper from 2003 that describes a implementation of coroutines in C# using the Fiber API.

The imple

Answer 1

Coroutines, at very first glance catches my attention.. some days ago i was searching for workflow solution for parrallel AsyncWCF Method calls and what i found was really fascinating:

http://csharperimage.jeremylikness.com/2010/03/sequential-asynchronous-workflows-in.html

this article shows a very good use of coroutines to create/manage workflows in Silverlight application that consumes WCF using Async Pattern.

I don't know its speed w.r.t to iterators but to me its like an advanced form of subroutines that can be very helpful in mission critical tasks where a normal subroutine can't offer you the luxury to perform a task in parallel.