On the Teaching of Literary Theory by D. G. Myers Originally published in Philosophy and Literature 18 (October   1994): 326-36.

Ideology: A Brief Guide is a useful way to think of  beliefs one holds about texts.

Political Discourse: Theories of Colonialism and Post-colonialism    contains many readings from theorists and writers on this topic

A Postcolonial Perspective (Work in progress by Terry DeHay)

Postcolonial and Postimperial Literature: An Overview

"Postcolonial Literature": Problems with the Term a good essay, and at the end of the essay is a site for post-colonial links tied in to the Voice of the Shuttle.

Post-Colonial Studies at Emory has multiple listings of both theorists and authors

 Global English created by Rita Raley of the University of California, Santa Barbara.contains texts from the major writers, British and colonial, on the effects and implementation of colonial policies through education, literature, and language.

Post Colonial and Post-Imperial: Terms and Issues lists common terms and definitions you might encounter in reading or discussing literature from this critical perspective. It is part of the Emory website and, I think, the strongest on line resource.  Each term is defined, discussed, annotated, linked to texts, authors and theorists.

Jouvert: A Journal of Post Colonial Studies, published by North Carolina State University, College of Humanities and Social Sciences, is on-line, both current and past issues with solid scholarly material focusing on national literatures of Ireland (the current issues) and North American Jewish writers, Indian subcontinent writers and so on.