www.askjeeves.com/
meta.rrzn.uni-hannover.de/
www.suchfibel.de/
www.dino-online.de/
www.alltheweb.com/

www.links2go.com/
www.google.com/
www.altavista.com/cgi-bin/query?
www.yahoo.de/Geisteswissenschaften/

http://dir.yahoo.com/Social_Science/Linguistias_and_Human_Languages/
 

WHAT I USE REGULARLY:

www.edge.org/