The following site is a good starting point to facts and information online. Lists topics by category, searches sites, all the good things students ask for and do not know where to start. There is a special "Homework Helper" section that offers useful links to online resources for any grade level. There is even the "Tools for Research Papers" link.

Refdesk.com ... Reference, Facts, News ... Free and Family-friendly Resources (http://www.refdesk.com)

Excellent resource! I did not know about it. Thank you!

Can we sticky this, wonderful pre-emptive post.