I’ve found Wikipedia.org to be an extremely useful research tool. However, I’ve found something even better:
This site will create a “mind map” of a Wikipedia topic. The value of this map is that it provides a visual representation of the topics that are adjacently related to your primary search phrase. This reduces the amount of time it takes to find what you were actually looking for. It also increases the chance you will notice a related and relevant topic that you were not anticipating.