I'm primarily a Linux/OSX developer and use Ruby for most of my web stuff - but I have to admit, for anything desktop related or dealing with a lot of Windows c

I'm primarily a Linux/OSX developer and use Ruby for most of my web stuff - but I have to admit, for anything desktop related or dealing with a lot of Windows clients (remote installation of services etc) Windows really takes the cake. JRuby has helped a lot with this recently but Java still looks/feels less natural than .net apps and often there's no cross-platform need in this space. Also, the Windows development tooling is still way ahead of the stuff you can get with Eclipse. I personally use Vim for my Ruby development, but intellisense that works can be really, really for exploring APIs or just navigating new projects. That being said, I've also liked the Xcode environment for the short amount of time I played with it. If Microsoft played better with other ecosystems, I would definitely consider bringing more of it into my workflow, but as it is I'd rather use open tools than best of breed.