Shift is can be another interesting key to hit. Many non-US keyboards have an extra key between shift and z (or whatever letter takes to place of z in a particular region. Not only are you reaching further to hit the shift key, but the size of the target is not much larger than a normal key.

In countries like Canada, life is even more fun. Most keyboards are of the US variety, yet many laptops come with the multi-lingual variant. Better get used to two keyboard layouts if you're using WASD with shift/control.