Sorry for the delay on my current release, but the new version is available, now!!
A nice new feature is to add a context to your callback. When you want to update several HTML elements (i.e. the innerHTML property), but you don't want to add a callback handler for each one you can add a context to the call, now. See the new example at http://ajax.schwarz-interactive.de/csharpsample/default.aspx .
The DLL is now a strong named DLL, it can be placed in the global assembly cache. You can add the httpHandlers section to your machine.config to have the Ajax.NET library available in all of you web projects.
I added Pocket PC (Windows Mobile PC) support, but on Pocket PCs there is not so much DOM support to modify HTML elements on the fly, but perhaps you can use it to send form data to the server.
Using special chars (like the Norwegian) didn't work in the last release. I fixed this, please tell me if there are still chars not working!
To download the latest Ajax.NET library click here: http://ajax.schwarz-interactive.de/download/Ajax.zip