The new MLL is pretty nice... I was there when it opened for about a week. At the time the showers weren't ready yet but otherwise, the layout was open and comfortable, with areas sectioned off for laptop and PC access.

If you get bored and go outside of security, the other thing to do is get a drink at the Expedia cafe... free cabled internet. There is a Sheraton connected to the hotel if you want to just relax in a comfier atmosphere. You can always trip out at the very cool art installation in the back of the landside terminal... really trippy cube things floating in water, with occassional jets of water to move it around.

But if you can, get to the city to break the monotony.

I was stuck for nearly 24 hours, so I may be a bit biased...