Although written from a particular philosophical perspective (the title gives it away...) there's some useful notes here covering the following general perspectives of interest to A-level students: Functionalist; Ecological; Marxist; Feminist; Structuralist; Symbolic & Interpretive and Postmodernist. Each perspective page can be accessed from the nice new menu that's been added to the site and the perspectives are outlined in terms of basic premises, key ideas, writers and works, criticisms and so forth. You need to be aware the material is written for: a. American undergraduates and b. Anthropology students, but this doesn't mean there's not a lot of potentially useful information that can be condensed from these pages by teachers.

Although the site hasn't been updated for a few years this is still a wonderful resource for those students and teachers wanting to gain a deeper insight into a range of critical perspectives, including:
Marxism
Postmodernism
Theories of Sex and Gender
The New Historicism (Foucault)
The materials are aimed at an undergraduate audience, but are clearly-written and A2 students should be able to follow at least the general arguments involved. For teachers things like lesson plans and sample applications (check out how to use Star Trek to understand postmodernism, for example) are included for each theory.

Yes indeed, Howard Becker does have his own site, on which you'll find a range of his contemporary articles (Interaction: Some Ideas for example, although "What About Mozart?, What About Murder?" is also interesting if you're thinking about philosophy and science - and, let's face it, who isn't nowadays?). You can, if you're so inclined, email the Great Man, but be warned: "I said everything I have to say about labeling (sic) theory in my book, Outsiders", so it's probably not a great idea to ask him for help with that essay you're supposed to be writing about Interactionist theories of deviance...).

A brief set of notes (covering basic assumptions and key concepts) for "four of the most prevalent "ways of doing sociology" current today" - Structural-Functionalist, Conflict,  Exchange ("New Right") and Symbolic-Interactionist frameworks.

Another site from the prolific Mike Kearl, this one covering a variety of aspects of social psychology (from questions of self and identity to science and modernisation, via a helpful table that categorises a range of social psychological theories and their associated methods). The focus is, however, sociological and although there's a shed load of information (and even more shed loads of links to further sheds loaded with information), this is a good starting point if you want to understand and explore this ever-popular general perspective.

A nicely-presented site that provides a range of introductory notes about Sociology, perspectives and sociological perspectives (among a wide range of other useful things). Although the navigation system takes a bit of getting used to, once you've sussed it there's a lot of useful information (in words, pictures and video) for students here (and the assignments sections are worth checking out by teachers). Helpfully, you can also download all the text information for storing in your folder and forgetting about (probably).

From 1600 to 1995, to be precise. If you want to locate various "social thinkers" on a timeline then this is probably something you'll go crazy over. Otherwise, for the rest of us, some of the entries are linked to different sites (although he Timeline doesn't seem to have been updated much recently and some of the links are dead - just like the majority of people featured here, spookily enough...).

Annotated notes covering a range of different perspectives:
Functionalism
Symbolic Interactionism
Phenomenology and Ethnomethodology
Conflict Theory
Feminism
Rational Choice/Exchange Theory
Social Construction Theory and Feminist Standpoint Theory
Post-Structuralism and Postmodernism
It's generally aimed at an American undergraduate audience, although a lot of the material is probably suitable for A2 students. Most of the external links no-longer work, which suggests the site is no-longer updated...