Scripting in C# - take 3

I've been ranting about the lack of scripting capability with C# (here and here).

Another example of what I meant could be M# (via Larkware) and F# - both having an interactive interface.

Why, oh why is there no such thing for plain old C#?

[UPDATE] After inquiring with Extreme Optimization, it turns out that I misunderstood their site. They DON'T have an interactive scripting capability (yet), so only F# has it, not M#...