How in-depth do you want me to get?

The short version is this: It has several specific sites that it visits (ign.com, aintitcool.com, comingsoon.net and gamespy.com) then it compares the site with a cached version of the same page.

Found new links? follow them. Then check the article to see if it has any similarities with any other news it's already posted. If so, don't post. Otherwise, pull the article and post it!

He always cites his source and provides a link to the original article. I will add some other sites to the "visit list" fairly soon

Oh, and his program runs as a cron job every 6 hours.