I generally don't make any announcement when I release a new MoMA for the new Mono release. This is because you just click the "Check for newer version" link, which magically downloads the new definition files and life is chock full of rainbows and ponies. However, for the 1.2.6 release, we made 2 important changes to the definition files that warrant a mention. - Removal of Design Namespaces - One of our awesome mono-vangelists pointed out that people scan their app (and third party controls) and see all kinds of warnings about things missing in the Design classes. However, these classes are not used to run apps, just for designers such as Visual Studio. So we are potentially scaring off users for no reason. Therefore, beginning with 1.2.6, we no longer include the Design namespaces in MoMA reports. (If you really want the Design stuffs, you can download the definition file that includes them on the MoMA home page .) - Addition of .Net 3.0/3.5 Classes - Beginning