"Deep" Web Research
This link leads to an extremely comprehensive listing of "deep" web searching articles and shortcuts. This is about going beyond Google or Yahoo, and finding information publicly available on the Internet that does not spring up from a simple search. From the article:
The Deep Web covers somewhere in the vicinity of 900 billion pages of information located through the world wide web in various files and formats that the current search engines on the Internet either cannot find or have difficulty accessing. The current search engines find about 8 billion pages at the time of this writing.These files are predominately used by businesses to communicate their information within their organizations, or to disseminate information to the external world from their organization. Searching for this information using deeper search techniques and the latest algorithms allows researchers to obtain a vast amount of corporate information that was previously unavailable or inaccessible.
Many of the links in the article are exceedingly helpful and worth a spot in your Favorites list.