"Do you have City of God?"
"The one by E.L. Doctorow?"
"No, no. Augustine"
"Hmm....uh, sorry."

But guess what! You can read the whole thing on Google Books! The greatest thing about this (especially in cases like this) is that, chances are, that patron doesn't want to read the whole book but rather is looking for a certain quote he remembers from college or information on a particular subject. Instead of scouring an index or a table of context (which may or may not be helpful), we now have lists of popular passages, subjects and reviews and best of all CONTROL F! I can search the entire text of City of God for a specific word! Yay! I love this!! I only wish I'd have known about it in college when I was searching books for appropriate research quotes.

It does seem like this would run into some copyright issues eventually, but from what I can tell most of the books are older, classic. Google Books is a lot more user friendly than other full text websites that list entire books. At my last job (which, unlike this one, was boring and mind numbing), I would look up books online to read while I was waiting for a phone call to come in (I worked in a call center). If I had known about this, I would have had a lot more to read!