A while back, I made a Scrabble “cheat sheet” that fit in the standard Hipster PDA 3×5 index card format. I used it for a few weeks, both in playing the Scrabble board game and Words With Friends. Unfortunately, it never quite worked the way I wanted it to.
A couple of weeks ago, I updated it to version 2.0 and have been beta-testing the new version. This one focuses primarily on valid 2- and 3-letter words — the sorts of words you need when playing words side-by-side and packing in tight matrices of letters. I am a lot more happy with this one over the original version.
You can find more information and the PDF download on my Hipster PDA Scrabble cheat sheet project page.