Personally, I’m all for the option of a Scripting language versus an Object Oriented Language; however with that said I obviously understand the reasons for actually needing the power, speed & precision that comes with the added and usually grueling work. Nonetheless, if your choosing to go down the path of writing your beloved game in Unity 3D with C#, here are a few resources I’ve gathered to aid your process. That is of course if your migrating from their JavaScript dubbed UnityScript. Otherwise if your already an expert with C#, keep in mind that you won’t really need/have to know any of .net as that’s not really applicable.

• Getting started with C# for Unity3D
• Unity: Basic C# Templates for Visual Studio
• Converting Unity 3D JavaScript to C#
• Unify Community ‘Programming with C# and Unity’
• Unity: Overview: Writing Scripts in C#
• C# Bundle for TextMate

As for compiling your code, I’d highly recommend TextMate for Mac OSX. There’s also MonoDevelop 2.2 which is in beta for the mac.  As previously stated, I personally don’t code in C# so I’m not attesting that it’s actually great for that language, however I have heard read it was.

If your on a PC, you could just use the default Unitron that comes with the install, or there are a few other options, none that I’m familiar with personally.

• Visual Studio Standard
• Visual C# Express (free)
• Mono 2.4

And if for what ever reason your developing in Unity using a Linux box, here’s a source for you too: MonoDevelop