Play a multitouch HTML5 Tetris clone -- don't worry, keyboard will also work great: http://htmltetris.com

A huge fan of tmux, and I use Sublime Text and (more often) the indomitable Vim.

I have some special experience with:

• too much JavaScript
• too much CSS
• OpenGL
• animation, simulation...
• application security
• HTML5
• databases
• C++, template metaprogramming, applied clang c++ metaprogramming
• bunch more stuff I can't remember now