I like these, too. I like that they're moving in a less formal direction. If you do any others, I'd love to see what the words would look like sized to fit inline with the icon. Does that make sense? Like a rectangle where all the elements fit to the sides?
scales well to small sizes... most importantly its clever, memorable, & conceptually relative... the whale/book concept has a little more meat to it than random things found in the ocean floor which in turn give the logo the "oh", "that's cool" factor... it also communicates what you guys do even when its not sitting on the binding of a book (with or without the name)... thanks for your time.