I'll give you the same advice as my wife gave me (she was on jury duty about 6 months before I was). If you're selected and it's a civil case, when you go in to deliberate, volunteer to be foreman (assuming you know how to take charge).
I was on a jury for a civil case and was amazed that there was really no instruction given about how the decisions about fault and monetary damages were to be made. The thing could have gone on forever, but I just let everyone say their piece, took everyone's suggestion for an award, averaged them together and boom, we were done.
Neither attorney seemed too happy when the award was announced, so I figure we did OK.