In fact, I have made a cheet sheet, and if i had the cardstock i would probably use it for a screen (or maybe i'll clip it to my Arcana Unearthed screen). I use horizontal/landscape orientation. First page is two columns, with Health conditions and recovery times, followed by Fatigue, social info (houseruled information based on a Monte Cook Line of Sight column) and a list of sample Difficulties for ease in adjucating on the fly. Second page is also two columns, intended as a player handout but also useful for a GM: first column lists the uses of Extra Effort and Conviction, second column is just the Familiarity chart for psychic powers.
If you'd like the word .doc i have, to save yourself time in typing it up or formatting, email me: xitaqa (at) yahoo (dot) com. Be sure to put True 20 Cheat Sheet in your subject line to reduce the risk of accidentally being deleted as spam, and remember that i get online pretty sporadically, so it may be a wait before i can reply (during which time you may find it worthwhile just to type it up yourself, of course).
I haven't put the skill charts on the sheet yet, but i've been meaning to for a while. Maybe I'll finally get around to it now. If there's anything else you'd like in it, go ahead and request it. I suppose that carrying capacity and load effects really belong there, but i've just never bothered to use 'em in play.
No kitten is going to tell me what to do. I'll fall off this branch to my death if I feel like it!