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I write mostly in c#. But as you probably know it ends up being a mix of many. Java, javascript, powershell, perl, python, php.. heh.
I have a few large production apps which are mostly .net-c#. What do you write in?

Right now I'm focusing on Javascript. I'm building, with some help from another guy, an internal web app for my business to replace an older web app.

Cool. Been there, done that a few times. :)