Programming
I'm foremost a programmer and I enjoy software engineering in general, from developing games to implementing web services, from enhancing user experience to optimizing performance.
C# is my preferred programming language and the one with which I'm most experienced, along with the DotNet platform. Python is a close second, and I've been using it extensively these past few years. I'm also moderately proficient with C++, Java and JavaScript, although I've been exposed to those somewhat rarely.