Last Monday Bill Kayatta argued an interesting qui tam case in front of the First Circuit, U.S. ex rel. Loughren v. Unum Group. Justice Souter was on the panel. The RSS feed is now on line, so if you can hear the argument (link to cite below).
Among other things, Justice Souter's questioning of the appellee, and honing in on his issue, is very instructive, and if he continues to sit on First Circuit panels (see previous entry), we are lucky and had better be on our game.