"The 21st century is a time of rapid change, and while the brain may not be changing (much), the tools we use to feed it are.
This puts the 21st century teacher in a critical spot–of mastering constantly evolving technology and digital learning tools–the same tools their students use every day.
So below, we’ve started with 9 such tools, but this is obviously just scratching the surface. This list is not meant to be exhaustive (obviously), or even authoritative (but rather, subjective)."
Via Beth Dichter, Neil Finney