Pretty Sure I've Got A Toothpick Here Somewhere
From the Ask Metafilter archives: holterbarbour wants to put together a notebook full of handy reference information and mental utilities.
I'm imagining the user would bust it out of his/her bag and use the knowledge within to solve a wide range of MacGyver/James Bond/bar bet problems. An intellectual "Swiss army knife", if you will.
Mefites oblige, suggesting everything from slide rules to star maps, alphabets and animal tracks.