I write a lot of articles on various subjects. Whenever I am looking for information on a given topic, I check out the sources listed by About.com
I find that they have many high quality sites listed that never show up on any of the various search engines that I have used, and give me information that it would have taken weeks to locate through library research. About.com is one internet research tool that I would definitely not want to do without.
It is very simple to use, which makes it doubly ideal. Anyone can find valuable resources on nearly any topic. I also like the fact that you don’t get a lot of repeat listings.