Well, since I just got the summons, I had to fill out a questionnaire and mail that back, which I did. I also have to report in during the on-call period to see when I'll be summoned to court, if I'm selected. That won't be until late January when I have to call in every day.
In terms of actual jury duty, you go to court and sit on your butt and listen. I'll ask if I can take notes. It helps me to listen better. If the jury is sequestered, then they can't leave until a verdict is reached, and that usually only happens in difficult trials. When sequestered, the juror can't contact anyone outside of the trial.
You get paid $40 a day, transportation and even lodging (if applicable) is covered.