There are very few published general pulp RPG adventures to either run players through, else be harvested for inspirational material.

There was only one adventure published for the venerable Justice Inc, "Trail of the Gold Spike". Daredevils had a handful, ditto the two variations of the Indiana Jones RPG franchise.

Any-System Key
Griffon Publishing Studios has published its Any-System Key, which is a system for comparing task difficulties and character stats that is adaptable to almost any game engine.

Pulp Egypt -- A sourcebook for Egypt in the Pulp Era.
The Charioteer's Tomb -- An Any-System Key adventure set in Pulp Egypt
Enemies on the Horizon -- Another Any-System Key adventure in Pulp Egypt

Call of Cthulhu
Call Of Cthulhu, while taking place a decade earlier than the conventional Pulp Era, has several adventures available, both commerical and PDF examples. While Pulp Cthulhu is still awaiting publication,a couple of on-line examples from the Hard Boiled Cthulhu Campaign can be found here:

http://www.yog-sothoth.com/docs/scenario-d20-waters-over-heaven-1.pdf
http://www.yog-sothoth.com/docs/scenario-d20-shadow-in-the-tree-2.pdf

GURPS
The Tower of Babel-- A scenario for GURPS Cliffhangers

Risus
Trapped in The Museum -- A Solitaire Adventure by Peter Schweighofer (author of the Any-System Key) for Risus: The Anything RPG by S. John Ross

Savage World
Mystery of the Anasazi -- For the Ravaged Earth Society

Miscellaneous
Michael Chumbler's Pulp Scenarios
Pulp Adventure for the Confused -- Guide to writing pulp adventures