My friend NitNit, have you actually watched or read The Secret at all? If so, then you know that they SAY it's not new. It's one of those things that's so simple, people just forget to use it.
I don't know about "popping out of the woodwork" because frankly I don't pay much attention to the woodwork. I have read some of the books, though, and was delighted to see that some of this material is again seeing some popularity. Some of it, in fact, is being put together more coherently than it was when I first started reading some of this--and mind you, that was circa 1950s.
No need for the hostility: remember, what we send out just comes back. That's one of the messages in The Secret, too.