A pretty interesting tool for the web researcher is the Wikipedia. Set up as a comprehensive (and then some) encyclopedia in wiki format, you can find information on just about any topic, encyclopedic or otherwise. However, since it is a wiki, accuracy is not guaranteed. (If you’ve never heard of a wiki, that’s ok, not a lot of people have. A wiki is a web document (or series of documents) that are editable by the users at large.)
Also as part of the Wikipedia project, there are some other useful tools, including Wiktionary, Wikibooks and Wikinews. However, because of its open nature, vandalism and inaccuracy are problems in Wikipedia. You may also wish to read with an open mind, as there is no guarantee that a particular author will have the same political, religious, or philosophical slant as you.