A Comparison of Ajax Frameworks for ASP.NET:
First, let me explain why only these 6 Frameworks are included although there is a lot more AJAX stuff for ASP.NET out there. All the frameworks listed here have one unique AJAX feature: They allow updating page content without programming AJAX directly – i call it indirect AJAX programming – a compareable concept is called Hijax.
The list for the comparison includes:
- ComfortASP.NET V0.45 (beta)
- MagicAJAX.NET V0.2.2
- ComponentArt V3.0 Callback Control
- and more…
He has very detailed charts covering different topics like general information about the package, it’s ASP.NET compatibility, how much “traffic†it generates with its requests, and other additional features. There’s even charts for the traffic (in bytes) for a few different tests he performs with each package.
Now I do not use ASP nor do I plan too, but I know people who do (and they might be in my 2 or three readers 
You see this Aaron? hello any one out there….
(Via Ajaxian Blog.)
Yep, I see it — thanks! Looks like this guy did his homework — definitely useful.
For Aaron and anyone else interested in indirect Ajax I have just released a new version of OutPost, and it outperforms (traffic-wise) every other Hijax framework out there (at the moment)… Please take a look
http://hijax.net/Demo