Kraken! Kraken! Kraken!

Did anyone pick up the reference to kraken?  I can't remember which chapter it was in (somewhere in the 50s or 60s) but the annotation in my book said something about Melville going on to write a book about the kraken later--I can't figure out if he actually did or not.  

I was amused to see the reference to kraken and realize that it's a common theme, not just some completely bizarre plotline for Pirates of the Caribbean (not that they would come up with something so original anyway...).  

Here's a clip from Youtube that talks about the monster from the deep that is the Kraken, as shown in Pirates of the Caribbean. Sorry it has little to do with Moby the whale, but I hope you enjoy.