All I can say is, "Whoa."
I found this via Magic Cookie - who came very close to sitting on a jury with Justice Breyer.
I can imagine that this could create the potential for a lot of complications. Do you think that if you were on a jury with Justice Breyer, when you started deliberating, you would just turn to him and say "Well?" I mean, either you figure he's probably going to be right or you figure that if he doesn't agree with the verdict he can just get some of his buddies to overturn it later.
Do you think the lawyers and the judge would be on their best behavior? Do you think the case would be more or less likely to be granted cert? If, for example, you weren't very familiar with a Justice's positions, do you think reasonable voir dire questions might include, "What are your hobbies? Do you read any magazines? Do you more often overturn convictions or uphold them?"
The Justice Breyer thing aside, chickenmagazine gives a great summary of her experience as a juror. (And she aquitted! Way to go!)