Stallman at the Free Software Foundation website:
Debian’s decision to include Mono in the default installation, for the sake of Tomboy which is an application written in C#, leads the community in a risky direction. It is dangerous to depend on C#, so we need to discourage its use.
[...]
We should systematically arrange to depend on the free C# implementations as little as possible. In other words, we should discourage people from writing programs in C#. Therefore, we should not include C# implementations in the default installation of GNU/Linux distributions, and we should distribute and recommend non-C# applications rather than comparable C# applications whenever possible.

Here, let’s take a look at one of the main things that get’s me going about mono-supporters.There is a strong push to get Banshee in as the default media player in Ubuntu. Here’s my take on that.
Huzzah! Continuing the series of addressing one small point of mono misinformation at a time! This time I’ll take a look at a common defense of mono which has a few of interesting bits to it, some obvious and some a bit more subtle.