HOW TO: Advanced Google Tips
Google has quickly become one of the most well known words in the world and is used by millions 
daily, including myself. In an advanced database class back in university, we spent a couple of weeks studying the inner workings of search engines, and one topic which happened to come up was data mining using Google. Much to my surprise, out of a class of 80 fourth year computer engineers maybe four or five knew how to use Google to perform any sort of advanced queries.
Google (and many other search engines) has the ability not only to search on keywords, but also using a more “database-ish” query language to really narrow down your search results. Below is a summary of a few of the most useful lesser known features. CyberWyre » Advanced Google Tips - Making A Living 100% Online