Remember doing a FAST pass and hoping that the spectators won't notice anything is very very naive.
Now go practice !!!
Larry Jennings was darn naive then!
He did a riffle pass, and the spectator wasnt watching. He cut the deck, told her to look, and did the riffle pass again ( this story is taken from R. Paul Wilson's ebook West Caost Pass ).
Learn smoothness, then strive for speed. Speed is important for a pass, simply covering it with a misdirection is good, but still not good enough, because you don't want to worry about people catching you everytime you do the pass.
Kaufman's DVD is good, especially for classic passes and their versions. Pass with Care is said to be good. Ken Krenzel's video is intended for those who already fimilar with the pass. Randy Wakeman has a pass DVD as well, which I dont have. For books, Card College is the way to start.
I had the chance to check Ninja one. Brad looks like a nice guy, and I keep alot of respect for him because of his forums, but with that skill with the pass, he has no right to teach this sleight. Look at his riffle pass, I'm suprised it flies by people. The teaching is way inferior. Here is the instructions: "You go from here, to here, to here, to there". Yes, its possible to learn from it by watching again and again, but you will miss alot of details because no one told you about them, and you wont see them because Brad doesnt show them. A beginner in the pass will have hard time with it, and an advanced "passer" will be looking for more info, and the only new one here is a version of the classic pass Brad's teaches, where you go waay up, then done. Its good, but will look natural in some hands, and very unnatural in other hands.
If you want to learn the pass, learn it from someone who do it well, especially if you want a video medium, where you want to see how the sleight should look like. I'm not bashing Brad, as I don't have the DVD, I'm purely judging his skill from the passes seen in the preview.