A-Level Links

Religion

 
Hartford Institute   BBC Online  
The Hartford Institute site offers a range of information and resources relating to all aspects of the Sociology of religion. In terms of links, for example, these include sociologists of religion, research resources and professional associations. More substantially, you'll also find a good range of on-line articles (most, admittedly, aimed at undergraduate audiences) and an extensive bibliography. The area you'll probably find most-useful, however, is the Encyclopedia (sic) of Religion and Society that offers articles on a wide range of religious themes. As you'd expect from the BBC, this is a professional, accessible, site that offers a range of information about religion and "the UK's main religions". As you might expect, the information is fairly rudimentary, but it's probably sufficient for (AS-level) students who want an overview of the history and basic ideas of various religions.
Religious Worlds   Religion Resources on the Internet  
Religious Worlds is a site that provides a comprehensive selection of religion-themed links (from those dealing with religious freedom, through freedom from religion, to religious experience). The links are clearly and fully annotated, making this a useful starting point for any student needing to explore facets of religious life in more detail. From the University of Virginia, this is a large collection of links to sites, covering religious traditions, religious movements and religion in general. A lot of the links are to sites aimed at undergraduates, but if you're looking for something specific of a religious nature, this is probably a good starting place.
Adherents    
In basic terms, this is a huge database of religions and statistics about religions. In other words, it should help you to find information about membership numbers, location and contacts for just about any major religion, denomination or sect (and an incredible number of minor ones as well...).  
Religious Tolerance   Religion in Social Context  
Although part of a much larger site, this particular link focuses on definitions of cults, sects and denominations. Although it can be a bit long-winded at times the site provides some useful - and well-linked - information in these areas. Although this seems to be an incomplete site originally designed to support the textbook of the same name, there is nevertheless a couple of useful pages here - in particular a short glossary and an observation-based activity.
 General Sociology Links

Religion

 
Max Weber   Bare-Faced Messiah  
Everything you ever wanted to know - and then some - about Weber and religion is included on this site. In basic terms, if you want to read Weber's primary texts (such as "The Protestant Ethic..."), then you'll find it here, alongside general commentaries about Weber's life and studies. The target audience is undergraduate (and people who don't really get out as much as they probably should...). If you're interested in Scientology (and let's face it, who isn't?) and want to know how it all began (with an obscure science-fiction writer called L. Ron Hubbard) then this is the site for you. Basically, it's the complete text of Russell Miller's 1987 magnum opus (which you can read on-line or download as a text file), plus a few bits-and-bobs (reviews, interviews and "key documents which expose Hubbard's falsehoods"). Oh, and there's also a very interesting section detailing the attempts of the "Church" of Scientology to suppress the book - scary stuff indeed...
Church of England   Religion In Victorian Britain  
Everything you ever wanted to know about the C of E (but couldn't be bothered to ask) is here of the official site. This is not strictly (or even remotely) true but you will find some interesting material about the Church and its activities here. Part of the very wonderful Victorian Web, the focus here is on religious behaviour and belief in 19th century Britain. Given that the site's aimed at American undergraduates it is, as you might expect, pretty text-heavy in places, but there's a lot of useful information here for both teachers and students. Not integral to the A-level course, but worth exploring if you want to understand the historical relationship between religion and society.