Anyone interested in slider lessons should seriously consider The Projects (
http://www.theprojectspark.com). Pat, Ryan and Robbie do a great job on giving you the right pace and instruction. Very laid back atmosphere. Great sliders. Link is my son John riding at the Projects last week with a little footage form the ProTour sliders at OWC Last year.
http://www.wakepics.com/view_single.php/JJ-on-SLiders_1139005977_wakeboarding-photo-image-video.html?medid=18193