For me, the lounge is an excellent place to get work done. I try to get there early if possible to get some solitary time in the club to make calls, check emails and so on.

As a sometimes smoker, it's also frequently a good place to grab a quick butt. If I'm in a club on a layover, it is so relaxing to get away from the masses in the concourse, re-charge the pc or cell phone and then head out to the nasty airport land.