This year I have decided to share one GIS or cartography-related post every day until Christmas. Most will be from my bookmarks archive, but I may also make a few guides on how to do nice things or share some personal work. I hope this can be useful for anyone interested in geography, GIS or cartography.
Colorbrewer
First out in the GIS Christmas calendar is a very useful tool for finding out how colours look on maps, and help choose colours for your own maps. You can select the number of data classes you have and which type of color scheme you need (sequential, diverging or qualitative schemes), and then get colour schemes with colours that fit well together. You can also see if the colours are colourblind-safe, colour printing friendly, photocopy friendly or laptop (LCD) friendly. I can recommend it, and it can be found at http://colorbrewer2.org/