Oxford U. Press: Word of the Year 2009

Apparently, the Oxford University Press keeps track of new word usage across the anglophone world and this is what they came up with as word of the year 2009:

UNFRIEND - v. to remove someone as a 'friend' on a social networking site such as Facebook.

A more complete list can be found on their blog page.  Notable mentions include a lot of new twitter and Obama neologisms, as well as 'teabagger' and 'birther'.