Depending on the day, you either have to play Solo Café Bananagrams (the one where you get all 21 tiles at the start with no peeling) or actual Bananagrams games against other online opponents.
Here's exactly what you have to do to be entered into the drawing:
From January 25th through January 29th, if you finish a game of Solo Café Bananagrams in less than 40 seconds, you are entered into the drawing for that day. (You can qualify once per day.)
From February 1st through February 5th, you have to win more than 12 Bananagrams games (in one day) against other players to qualify for that day.
And from February 8th through February 12th, you have to finish one game of Solo Café Bananagrams in less than 35 seconds.
You can play on any of the four venues for online Bananagrams (the iPhone app, Facebook, MySpace, or Bebo).
The information posted on Facebook on the

Good luck!