Check out PC Magazine’s list of Top 100 Undiscovered Websites: http://www.pcmag.com/article2/0,1895,2174685,00.asp. There seem to be some great reference tools among these, including Ninjawords (a really fast dictionary – like a Ninja): http://www.ninjawords.com/ and Footnote: The place for original documents online: http://www.footnote.com/. The list includes websites in all kinds of categories from cooking to finance. If you are like me, you will want to bookmark several of these. Enjoy!