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
