So far, my favourite thing about Facebook is Scrabulous. For the uninitiated, this is online Scrabble, where you can take as long as you like to put a word down (no screams of 'hurry up') and you can play with the tiles on the screen to help you choose the best word. Once you've put the word down, a notification is sent to your opponent, who then plays a word when he/she has time. Games last days (I haven't finished one yet) but who cares? You can play three games at once!
More ways to play with words - heaven!