If you buy Mass Effect 2
any time from now until January 31st, Direct2Drive will automatically enter you in a contest to win one of ten 8GB special D2D edition iPod Touches. A new winner will be announced every couple of days, so for the best chance to win, I'd jump on this now.
To learn more about it and to enter the contest, head over here
. Of course, no purchase is necessary to enter. Just follow that link and enter.