Download PD Books at Google

Google is offering some public domain books in downloadable PDF format.  There have been plenty of PD works available for a while but you had to scroll through the pages using G's web interface.  I browsed around and found some good stuff from my old buddy, Aristotle:

Download the PDF of Congreve's 1874 edition of Aristotelous ta politika: the Politics of Aristotle - Greek text with introduction and notes in English.

Search for works on or about Aristotle with "Full View" at Google Books Search.