I have gone trough trudeau`s course but did not like it to mutch.
Dominic O`brien has a more complete memory course called "super memory power"( 12 tapes and 4 books)
With his many all over world memory champion titles he really know about memory stuff.
I have seen his course on half prize on the net.
Nightingale has also a new course by him.(don`t know mutch about course)