Some organisations now offer free subscription services. If you send them your email address they will add you to their mailing lists, and send you updates, bulletins, email publications on a regular basis. It may be worth subscribing to services that are run by key individuals or organisations in your subject area. These services are usually publicised on Web pages, and you will spot them as you catalogue other resources. This online newsletter is a part of the Social Sciences WWW Virtual Library.
Many sites contain lists of links to other Internet resources.
If you find a site that contains links to quality sites in your subject field it is worth bookmarking the site and checking it regularly for new links. With subject catalogues it may be worth finding the page for your particular subject and bookmarking this to monitor regularly. It's worth monitoring university departmental and library pages as these often link to quality resources. Bookmark social science pages and check regularly. Searching the Internet can be time consuming since many of the search tools yield results with high recall but low precision.