''Now known as GoogleGroups''
*** http://groups.google.com/ .
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Deja News was a feed from UseNet. It provided extensive searching capabilities, and also, with free registration, allowed you to post messages to the newsgroups. 
* It was at www.dejanews.com/ , and then just /www.deja.com/ (now redirects to google groups)
* Until March 1999 
** was one of the starting points when researching anything. Back then they still had their focus on archiving UseNet.
* From 1999 to 2001
** the Deja Archive was going downhill. A predictable and miserably stupid e-commerce thing that crammed their pages full of JigglingBaloney and inspired them to neglect their own legacy database.