Here are a few of my favourites (click on the book/video to order from Dogwise):

"Tracking From The Ground Up" by Sandy Ganz and Susan Boyd. Contains a complete TD tracking program.

"Tracking Fundamentals". Video by Sandy Ganz.

"Tracking Dog - Theory and Methods" by Glen Johnson. A Canadian Classic. An intense program, but it works.

"Fun Nosework For Dogs" by Roy Hunter. Tracking, SAR, Scent Discrimintion, Tricks... This guy has a sense of humour; a fun book.

Video on Gottfried Dildei's Schutzhund style tracking. I especially like the foundation work.

Joanne Plumb's video: "Foundations of Competitive Tracking: Basic Skills" Basic foundation work. A bit expensive for the amount of info, but still a good video.

Joanne Plumb's video: "Foundations of Competitive Tracking: Teaching Precision" I haven't seen this one, but expect it would contain good information.

"Training Police Tracking Dogs" videos (1 & 2) - my friend in Search & Rescue found this one to be very helpful. Teaches tracking through drive the way the RCMP do it.

"Hard Surface Tracking" - very cool video on hard surface tracking (Police style). Shows some amazing footage of dogs tracking on non-vegetated surfaces.