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When you call:
Random r = new Random();
You'll get an exception (division by zero), should return 0:
A 32-bit signed integer greater than or equal to zero, and less than maxValue; that is, the range of return values ordinarily includes zero but not maxValue. However, if maxValue equals zero, maxValue is returned.
Btw: Is it still possible to look at the source of MonoTouch somewhere? Or is that now closed?
That should already be fixed  but maybe it was not released in the version of Mono[Touch] you're using. It's hard to say without knowing the exact version numbers (in doubt please provide them* and I'll double check).
* The easiest way to get exact version information is to use the "Xamarin Studio" menu, "About Xamarin Studio" item, "Show Details" button and copy/paste the version informations (you can use the "Copy Information" button).
> Btw: Is it still possible to look at the source of MonoTouch somewhere?
MonoTouch source code was never open/public. However a large part of the BCL (including Random  from mscorlib.dll) comes from the Mono project - which is open source and publicly visible on github.