From the AP via SI.com:

Manager Joe Girardi said Wednesday that his spring training switch of Jeter and Johnny Damon atop the lineup has worked so well that as of right now, the Yankees captain will bat first and Damon second for the season opener at Baltimore on Monday.

I'm kind of scratching my head here. Both guys have success at the leadoff spot and they both more or less get on base at about the same rate, but Damon is a bit more of a speed guy (steals about twice as many bases per year as Jeter). Jeter to me is more suited to be that #2 guy who can move a runner over.

Then again, come to think of it, putting Jeter at the leadoff spot will take a few GIDP's away from him.