In order to promote its Google Book Search at the Frankfurt Book Fair, the search engine released a list of the most viewed books on the service from September 17th through 23rd, and it doesn't much resemble the bestseller lists that commonly appear in newspapers. The titles range from Diversity and Evolutionary Biology of Tropical Flowers to a translation of the Holy Qur'an to Build Your Own All-Terrain Robot.The quirky titles on the list highlight the different ways we interact with books. The New York Times and Amazon create lists based on books we buy, LibraryThing, as I mentioned yesterday, creates lists based on what we own, while Google's list is based on books we look at. I think these different ways in which we interact with books are sometimes forgotten by publishers who assume that books exist only to be part of a commercial transaction. In reality, our relationship with books is much more varied and complex than that.