Comte, Ayer and Logical Positivism
Lecture reviewing the development of this doctrine and its impact on psychology.

FOLDOC: Logical Positivism
Entry from this philosophical database, including an excerpt from The Ism Book.

Neopositivism: Linguistic Philosophy and Critical Rationalism
A section from Andras Gedo's work Crisis Consciousness in Contemporary Philosophy.

PhilosophyPages: Logical Positivism
Concise survey of this school and the related doctrine of "ethical emotivism."

PhilSci Archive: Logical Positivism/Logical Empiricism
Collection of online papers in Microsoft Word format, with abstracts in HTML.

Wikipedia: Logical Positivism
Entry from the openly-edited encyclopedia.