http://www.google.com

http://www.searchedu.com

http://www.dogpile.com

http://www.savvysearch.com/

http://www.askanexpert.com (general)

http://www.sciam.com/askexpert/ (Scientific American)

http://njnie.dl.stevens-tech.edu/askanexpert.html (genl, plus expert links)

http://www.allexperts.com/

http://www.cln.org/int_expert.html

http://www.askme.com/

http://www.refdesk.com/expert.html (lots of expert links)

http://www.mit.edu:8001/people/cdemello/univ.html

http://www.ehow.com