Wow! George Bush has spiderman reflexes! He barely misses the shoe thrown by an Iraqi Journalist. Not just one shoe, that's two shoes!
I feel like throwing my shoes at him too.
'Danag' is a very old Visayan (Cebuano) word that means 'image/silhouette in the dark'. I haven't heard of any legends about them. I don't know where S. Meyers got hers. But our farmhands said these beings move as 'fast as the blink of an eye'.
Danag was also mentioned in a book by a local Filipino writer David Hontiveros in his book "Parman".
And this book by Hontiveros was published prior to the publication of Twilight. So it seems that there are some Filipinos who really are familiar [or have heard] of it.

hey danag is also a word from one of the dialects in philippines. from area of luzon, ILOCANO dialect which mean "worries/ worry" i guess. hehehehehe