Just watched the movie again yesterday and noticed something puzzling that I never thought about before. While Obi-Wan is snooping around on Geonosis he gets within 20-50 feet of Count Dooku twice! Once in the hallway and once while spying above the conference room, where he is actually within line of sight of Dooku!
Now seeing as how Vader sensed Obi-Wan's presence on the Death Star and Luke's on Endor; do you think Dooku sensed Obi-Wan on Geonosis and just kept quiet about it? Or did he just not sense him at all?