Just to let you know, I have now taken down all the files in the old help section. For the moment, they are redirecting to the new help section, or in some cases to a forum post (for example, for the Advanced accounts page), or the wiki (for the Style Guide pages). At some point in the future, the old help.discogs.com part of the site will get turned off completely, so please take this opportunity to update your bookmarks to the new pages.
If you are interested in what pages were up at the old site, and where they redirect, you can use a Google search http://www.google.com/search?q=site:help.discogs.com to list all the pages, and the Internet Archive http://web.archive.org/web/*/http://help.discogs.com will have a copy of all the old text.
All the text has now been transferred to the new help section http://www.discogs.com/help/docindex , where it will continue to be updated and refined.