When it comes to software development, there are two very distinct camps on the subject of tools: those who prefer to keep it simple with just a text editor and a compiler, and then those who go straight for a fully-featured IDE with all the bells and whistles. For more than a decade, the undisputed champion of IDEs is Microsoft with its assorted versions of Visual Studio. Having come from years of work on Visual Studio, nothing pained me more than the first (several) times I started up Eclipse.
The majority of Android developers use Java to create their apps. While Java isn't the hardest programming language to learn, it's always best to get as many people developing as possible.... not that Android is hurting in that respect. Even so, a new way to create apps using Microsoft's familiar C# language is now available, by way of TallApplications BV's Dot42 - a tool that aims to accomplish this task without requiring something like mono.