I recently had the opportunity to test out something that I normally would not have thought of looking at... the Netbeans platform. I knew of and have used Netbeans on many occasions (being my preferred java IDE), but I was not aware of the coolness that is the "Netbeans Platform".
For those unaware (like I was), here is a nice link with some screenies:
here. Basically, the "Netbeans Platform" is the IDE itself. So, what's so cool about that? Well, the cool part is that you can very easily build modules, plugins, etc... ok, so you can do that with Eclipse, Visual Studio, etc. But, you can also ship the IDE with the stock modules all disabled (or not) and have your own branded for your application. This framework already provides so many rich features that I think my choice for .Net for Ogre Studio is a bad choice... Mainly, I had to re-implement many basic things and still am not as feature rich as these other tools. Of course, .Net is awesome for creating custom controls, but doing some controls in Java is also not so bad.
Anyway, I am now also aware that eclipse also offers an "Eclipse Platform ", so I think I may have to do some research into which platform is the best to use as a base in future tools. Since .net and Java are similar, at least most code can be reused

Although, I am also aware of the Ogre4j guys already making a tool with Eclipse and Ogre, so I will also have to research that a bit more.
Feel free to post any thoughts, comments, choices, etc about either platform or even with reasons to stick with .Net... The biggest advantage I can see is that with Netbeans or Eclipse, the tool starts off multiplatform :-)