It seems like most sites offer RSS feeds (a method of subscribing to new postings), but every so often I’ll run into a site that doesn’t, but should. For example, say you want to be notified every time a certain company posts a new job listing, or every time a library adds a book on a certain topic.
For those situations, you may find Dapper useful. Dapper is part of a new breed of Web ventures called (unpleasantly enough) “scrapers” — they scrape data from other sites and turn it into usable chunks of information that you can manipulate.
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