Christian Hubinger has updated the Wiki at http://www.borgworx.com/ [1]. You will find detailed information how you can get a license to use the Ajax.NET library in your projects. Also, Christian has added a info how you can become a BorgWorX developer [2] to submit changes using the SVN repository. A forum will be online next week, too.
Update: The forum is available at http://forum.borgworx.net/ [3].
For those of you working with the version from http://ajax.schwarz-interactive.de/ [4]: there is no restriction to use this library in your projects. It will be still free and without any warrenty. The latest released version there is 5.7.22.2.