Just today I worked with Markdown, LaTeX, PDF, Postscript, SVG, Python, GIF, and HTML. Most of that was in some way or another related to the Master's thesis I'm working on, but it's honestly pretty typical. (The HTML was not -- I decided to curl some spam sites linked from my email and read through their JavaScript, to trace down and see what sorts of deliciously painful exploits they were trying to install -- turned out it was just advertising crap.)