Yep, Amy was first. Amy's videos all appeared here in 2004 (some of our early videos were posted on her personal site dating back to early 2000 probably. That's where KH has it's humble beginnings). KnitPicks didn't have video until long after KH. I think they started doing videos just last year, or maybe 2007. Their videos are hosted by youtube which wasn't around when we started.
I think KP based some of their videos on Amy's content. We were watching a few of them a while back and were like "gee, these look kind of familiar!" We honestly don't care. These are all techniques, no one owns the techniques. There is bound to be some duplication when people cover the basics. You can say we all a little guilty of copying Elizabeth Zimmerman who was the first to take knitting to video.
Anyhow, you can set them straight over on the Ravelry group.