Update: a Windows installer package for version 3.0.1 (including a hotfix) is now available here on Mono’s official website. The below information is no longer relevant.
I managed to compile the master repository from GitHub on Cygwin following the official instructions, but the binary files I generated were somehow not good enough for use in MonoDevelop. So, I went on trying to generate a Windows installer using scripts from the mono/release repository. I had a limited success due to the lack of documentation and maybe the fact that I was using Windows instead of Linux.
Xamarin and all the project contributors are doing a great job. Those who are knowledgeable about the build process should document it better (and if possible simplify it) to as to share the love even more and encourage people to contribute. It is really motivating (and necessary for debugging purposes) to be able to see how code modifications can improve a compilable/installable/working version of the program.
Anyway, I tried to locate with Google a theoretical installer file name that would be consistent with the Mono 2.11 version: “mono-3.0.0-gtksharp-2.12.11-win32-0.exe”, and happily found a link in a publicly visible workfile. It seems to work well and come from the continuous build system MonkeyWrench.
I have mirrored it here: mono-3.0.0-gtksharp-2.12.11-win32-0.exe.
Enjoy and long live Mono (and .NET).