Useful XKCD charts

Internet / World Wide Web (www)

http://xkcd.com/195/ Map of the Internet.

http://xkcd.com/256/ Online communities

http://xkcd.com/802/ Online communities 2.

http://xkcd.com/124/ Blogofractal

http://xkcd.com/94/ AIM Profile creation flowchart.

http://xkcd.com/1335/ When can we disturb them?
http://xkcd.com/now is now a shortcut to the above.

http://xkcd.com/773/ Intersection of what university websites contain and what people really look for.

Science

http://xkcd.com/388/ Grapefruit varieties

http://xkcd.com/1056/ Best known Felines

http://xkcd.com/273/ Electromagnetic spectrum.

http://xkcd.com/1080/ Visual Field tester

Quantity comparisons

http://xkcd.com/482/ HeightChart - the observable universe, from top to bottom.

http://xkcd.com/1040/large/ Lakes and oceans

http://xkcd.com/485/ DepthChart - Size of matters on a log scale.

http://xkcd.com/1338/ Earth's Land Mammals By Weight

http://xkcd.com/1389/ Solar system solid surfaces stitched together

http://xkcd.com/1461/large/ Spacecraft mass measured in horses.

http://xkcd.com/1649/ Fluids manufactured in US

Units of measure

http://xkcd.com/526/ Converting to metric.

http://xkcd.com/394/ Kilobytes.. there are several of them.

http://xkcd.com/1205/ Is it worth the time?

Nature Alarm

http://xkcd.com/1379/

http://xkcd.com/1732/ Earth Temperature timeline/

 

Timelines

http://xkcd.com/1491/large/ Stories Published Time Vs Time they are set in

http://xkcd.com/1392/ Dominant sport players over time

http://xkcd.com/1410/ California Draught

Misc

http://xkcd.com/832/ Complete map of optimal Tic-Tac-Toe Moves

http://xkcd.com/1196/ Subways of North America

http://xkcd.com/1468/ Worries

http://xkcd.com/1509/ US Movie Background Cheat Sheet

http://xkcd.com/1688 Map Age Guide

http://xkcd.com/1626/ Judgement day (Not really a chart, but I wish this happens one day)