Not necessarily blackhat, these types of scripts can be used for grabbing data and using it for other purposes.
This one scrapes links.
http://www.bluehatseo.com/guest-post...inks-with-php/
Quote:
Uses:
* Build a search engine from the content you gather. Google
* Analyze a site to determine how well it is SEO optomized for keywords. SEO Book’s Keyword Density Tool.
* Republish free content dynamically on your website.
* Create an RSS feed from a website. Using PHP To Scrape Web Sites As Feeds
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