There's this site, I don't know why they took it down (and then linked to the archive.org copy - maybe they didn't want to keep paying for hosting):
http://etext.lib.virginia.edu/nrms/
The introduction and main page (in the archive site - these links may load slowly) are here:
http://web.archive.org/web/20060907005952/http://etext.lib.virginia.edu/relmove/
This is the list of groups they've studied, which looks pretty comprehensive, and was close to up to date about 10 years ago when the site was active. Scroll down through here and read the names - many are sure to be familiar to you:
http://web.archive.org/web/20060902...ments.lib.virginia.edu/profiles/listalpha.htm
This site really discusses everything, from major religious groups to small fringe groups, without saying whether such a group is a "cult." That's a derogatory word that virtually no group would use for itself, though from reading some of the writings on that site, a century ago the word had no more negative connotation than sect.
The list also includes multi-level marketing groups, both generally and a few specific ones. The list calls them para-religious groups abd direct sales organizartion, but informally I'd call them "business cults" as opposed to religious cults. Amway, for example, would be a business cult because of the way it operates and the beliefs it promotes - specifically regarding how to get rich - even though the founder was a strong Christian and there may be some Christian theology in the founder's and group's writings).
I read through a lot of that site about ten years ago, and have read quite a few books on cults. Be aware that what gets called a cult and why can vary quite a bit between different authors, as the word in its derogatory definition quite nebulous. Definitions have been derived from the thought that "I know it when I see it. Some might say "such and such can't be a cult because it doesn't have a living leader (I've seen an "expert on destructive cults" use this definition online), but that' not necessarily so. Perhaps the best way to decide is to make a list of the specific characteristics of groups that are widely known to be destructive and that many agree are "cults" and then see how many of these characteristics apply to a group in question. The more characteristics that apply, the more easily it is to label it a cult.
One more thing, this 12-minute film is a hoot. It doesn't name names, but it describes a LOT of common techniques. But watch out, that music is gonna hypnotize you:
http://www.youtube.com/watch?v=mnNSe5XYp6E