I've started trying to come up with a list of secondary works on the ancient world that I've never read, or never read in toto, and would like to and that seem in some sense to be seminal ('scuse the alliteration). Here's the list so far, in no particular order except perhaps that of the alphabet:
Buck, Carl Darling. The Greek Dialects.
Dodds, E.R. The Greeks and the Irrational.
Finley, M.I. The Ancient Economy.
Frazer, James. The Golden Bough.
Gibbon, Edward. The Decline and Fall of the Roman Empire.
Guthrie, W.K.C. A History of Greek Philosophy.
Harrison, Jane Ellison. Prolegomena to the Study of Greek Religion.
Heinze, Richard. Virgil's Epic Technique.
Jaeger, Werner. Paideia.
Sandys, John Edwin. A History of Classical Scholarship.
Syme, Ronald. The Roman Revolution.
Williams, Bernard. Shame and Necessity.
Comments are open, so please contribute any ideas if you have them, and I'll try to repost the updated list later. I'm especially interested in recommendations for standard works on Greek history and historiography and ancient religion, but don't let that limit you. Also, if anyone has favorites for handbooks/histories of Greek and Latin literature, I'd love to hear them.