There's all kinds of search engines for all kinds of things general and specialized. These are some of the ones I use most often.
G
o
o
g
l
e
Usenet Archive
White
&
Yellow
Page search
Find
Law
Medline
SecurityFocus
Latitude & Longitude
IP Index
TCP Ports
ARIN Whois
Internic
SEC EDGAR
Abebooks
Internet Movie Database
CD Database