http://www.besthistorysites.net/index.php/american-history

1. Univ of Texas Library "High School Research Resources" portal:
http://libguides.uta.edu/highschool

2. Florida Center for Instructional Technology, "The Internet: Ideas, Activities, and Resources," Chapter 5, "Research Tools":
http://fcit.usf.edu/internet/chap5/chap5.htm

3. Virtual Learning Resources Center (note also the "Related Sites" section):
http://www.virtuallrc.com/

4. NoodleTools/NoodleQuest:
http://www.noodletools.com/noodlequest/
A non-interactive version of NoodleQuest is here:
http://www.noodletools.com/debbie/literacies/information/5locate/adviceengine.html

5. The Internet Public Library (a SILS fave):
http://www.ipl.org/

6. Search operator tips/source evaluation/ethical use of resources:
http://kschimmel.hubpages.com/hub/Using-Internet-Search-Engines-for-Academic-Research-3-Lessons-for-High-School-Students

7. SweetSearch:
http://www.sweetsearch.com/TenSteps

8. Best of History Websites
http://www.besthistorysites.net/index.php/research

9. And finally -- you probably already know about this one, but:
NC Wise Owl: Primary Source Web Sites 
http://www.ncwiseowl.org/zones/professional/Primary_Source.htm

http://www.instagrok.com

teachinghistory.org website reviews. GREAT LAUNCH PAD. Over one thousand historical websites reviewed. Easily searchable by period, topic, resource type, or keyword