Like many other homebrewers, I'm sure, I don't have my brix chart memorized, nor my hydrometer temp correction factor, etc. So, I made a quick little cheat sheet I can print out and tape to the inside lid of my brewing toolbox.
Here's what it looks like:
It's pretty simple and modular, so you could just print it out and cut out what you need. Just click the image to download a PDF of it. For every other country in the world, here is a chart with all temps in Celsius. Find it helpful? Is there something I'm missing? Let me know in the comments. Cheers!
*Edit 2014-12-04: I adjusted the yeast rehydration temp from 95-105* F to 80-90* F. I think I had taken the initial temperature range from How to Brew or Northern Brewer's website, but as rimandro pointed out, Fermentis recommends low to mid 80's, and Danstar Recommends mid 80's to mid 90's. Also, added a sheet with temperatures in Celsius.