These books should really be considered pieces of art due to the fact that Brian Dettmer is a recognised American contemporary artist. He works into books a lot and his work like this is largely referred to as his 'book autopsies'.
Although this work is widely cosidered to be a piece of fine art, it is still nevertheless an innovative way of presenting a book. The whole notion of ripping out and layering pages is a very interesting way to present images and information in an innovative way whilst still maintaining the purpose of a book.
These images can be found at: http://37signals.com/svn/posts/921-brian-dettmers-insanely-creative-book-autopsies