Here’s a look back at some of the best post from December 2009:

Build an online portfolio with Carbonmade

Teach history with these comic collections

See the history of aviation at NASA’s Lessons of a Widowmaker (and Other Aircraft)

YouAreHere teaches kids to be smart consumers

Get these extensions for your Google Chrome browser

Try yWriter for long writing projects

NORAD lets kids track Santa in Google Earth

Take your class to the Lincoln Memorial Interactive

Update, monitor Facebook and Twitter accounts with Brizzly

Learn about penguins and the environment at Penguinscience