There are plenty of other explanations for the dampening of Google’s ardor [for Google Books]: The bad taste left from the lawsuits. The rise of shiny and exciting new ventures with more immediate payoffs. And also: the dawning realization that Scanning All The Books, however useful, might not change the world in any fundamental way.
But, interesting possibilities definitely remain on the horizon. While it remains to be seen what of those materialize, Google Books still provides a useful tool in its own niche area.
Google Books has available the full text of Sanday and Headlam’s commentary on Romans in the International Critical Commentary (5th ed.; 1899). The basic bibliographic entry is available here (BibTeX).
Google Books has available Octavius Owen’s two-volume translation of Aristotle’s Organon. Volume 1 (1901) includes Categories, Interpretation, Prior Analytics, and Posterior Analytics. Volume 2 (1902) includes Topics and Sophistical Refutations with Porphyry’s introduction to Aristotle.
At present, I am doing a little bit of work on the phrase εἰς ἐπίγνωσιν τοῦ μυστηρίου τοῦ θεοῦ, Χριστοῦ in Col 2:2 (NA27 punctuation) and happened to stumble upon J. B. Lightfoot’s commentary on Colossians in full view, PDF format on Google Books. According to Lightfoot (239),
The “note” to which Lightfoot here refers is too lengthy conveniently to reproduce here, but it may be found on pgs. 318–19 of his commentary.