[Mono-osx] What technologies did Unity use?

[MacUser]

I just saw Miguel's post about Unity's new Windows/Mac cross-platform IDE: 
http://tirania.org/blog/archive/2009/Mar-19.html
http://tirania.org/blog/archive/2009/Mar-19.html 

We'd like to do something similar.  Can anyone give some clues about what
technologies they used to do this?  It says the GUI is built in C#, but does
this mean that they made custom controls written using Mono's WinForms/GDI+,
or something else?

And beyond Unity, if a company were to build their own unique single-source
GUI that was to run the same on both Windows and Mac, what would be the best
way to go about it?

Thank you!
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