The latest videos from XF
I thought they are pretty interesting and illustrate the demoed lifts well, except the deadlift.
All of the deadlifts in the Crossfit deadlift video showed extremely light weights.
That's fine, but if you are programming stuff like "Deadlift: 5-5-5-3-3-3-1-1-1" then you are going to see a complete and utter breakdown in this kind of form.
A quick search on YouTube reveals a lot of competitive PL deadlifts, and you'll see very few of them, if any, that look like that perfect "clean" style deadlift on the CF video.