Here's another tip that I picked up from a post on Cool Cat Teacher: learn to explore the deep web. It's about five hundred times larger than the surface web that Google and Yahoo explore and make available through their search engines.
What is the deep web? According to the InternetTutorials web site, it is the term used for all those sites on the Web that we can't search and view so easily or freely–sites such as dynamic databases, non-textual content (images, movies, etc.), and access-restricted content.
So how do we get to it? Not so easily, it seems, but the tutorials linked to above provide some tips. Check it out. Be aware.