"The diverse, startling adversaria of Google Books merits examination and exhibition. The aim of this project is twofold; to recognize book digitization as rephotography, and to value the signs of use that accompany digitized texts as worthy of documentation and study."
The types of mishaps they've uncovered go from unwitting scans of the hands of the people scanning the pages to burn marks, marginalia, library stamps, distortions and objects left between the pages:
Feeling inspired? Want to start hunting for your own Google Books treasures? You can find a helpful guide to get you started here. And if you'd like to add you findings to the blog, you can submit them here.