There is a .NET version of Prevalence, which is mentioned in the article as the foundation for many of these apps. So, you could easily support this with .NET.
Prevalence is not the foundation of Continuation-based web servers - not even Prevayler is. Continuations are sort of like goto's with context. The only languages I know of for continuation support are Scheme, SML NJ, Smalltalk (now Avi Bryant has written them in), and Ruby, although there may be more.
The theory of continuations is kind of hard to wrap your head around, but the practice of writing web apps in Seaside (Avi Bryant's smalltalk Continuation-based framework) is incredibly simple.
Technically all you really need to do is save the cumulative state in viewstate. Not that I am recommending this, but it's not that complex an idea or application to do.
Is it great that someone has written a framework to do it? Yes.
I'll just stick with the UIP. I haven't had a problem with the Back button on the UIP.
Continuations in Ruby, Lisp, Smalltalk, etc... let you specify a code to execute after you function has executed. Something to do instead of 'return'...
Continuations in web development (ala Seaside most recently) are a bit different but use the same metaphor. I'd almost compare them to the new iterator support in the next rev of C# - the 'yield' statement. Continuations in web development let you write code like this.
Get state from user
lookup all cities for state
let user select city
lookup all locations in city
ask user for location
So in smalltalk or other dynamic languages this means you are writing a work flow with a single bit of code, as opposed to ASP.NET where you write your code on a postback by postback basis. In .NET the example would look like
if state = 0 {
Get State from user
set state = 1
}
if state = 1 {
Lookup all cities for state
set state = 2
}
and on. so mostly it's about a simpler developer experience. The downside to these are that it's all session managed. Either you put it in the URL and have fugly URL's or you put it in a cookie and can't run the same app twice from different windows of the same browser (cookies are shared).
If you know smalltalk - snag a copy of squeak and seaside - it's kind of fun!