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:

• JavaScript & CSS & HTML5 Application design and architecture
• OpenGL & WebGL
• CUDA
• Animation, simulation, etc.
• Application security
• Databases: MySQL, Oracle, SQLite
• C++, template metaprogramming, applied C++ metaprogramming, Clang & LLVM