[Jtsummers]

Covering the keys, like others suggest.

Work on transcribing your notes from your notebook into a digital notebook. Doesn't matter if you keep them, it's the act of typing that you want to practice. One of the biggest improvements I saw was when doing something like this (though transcribing for professors, not for myself). I was already a decent typist at that point, but having to keep my eyes on the text while typing (and not on the screen or keyboard) improved my skills significantly.

Don't put the text behind or beside the keyboard. Put it to the side and up. Get a small stand (like the stands for cookbooks) and set that beside your computer, next to the monitor. Your keyboard will still be in sight, but keep your eyes focused on the text instead.