Need to find someone or somewhere? Here's some good places to start.

411 Locate (offers reverse phone lookups in addition to its other features)
www.411locate.com/

Ancestry.com (a free Social Security Number search for deceased people, good for hunting up genealogical information)
www.ancestry.com/

AnyWho (combination people and business finder, with a strong reverse telephone lookup)
www.anywho.com/

AnyWho's Tollfree Telephone Lookup
www.tollfree.att.net/tf.html

AOL Government Directory (makes it easy to find and contact national government officials; not restricted to AOL users)
government.aol.com/mygov/

AT&T Help/Search: Directories (large, easily searchable yellow/white pages directory)
www.att.com/directory/

BellSouth Yellow Pages
www.yp.bellsouth.com/

Big Yellow (huge yellow pages)
www.bigyellow.com/

Canada (AOL-only resource for everything Canadian)
Keyword: CDN

Canada Francais (AOL-only resource for everything Canadian, in French)
Keyword: CDN Francais

ClassMates (a database of people hunting for old friends)
www.classmates.com/

Directory List (up-to-date links to the ever-growing number of search directories out there)
dir.yahoo.com/Reference/Phone_Numbers_and_Addresses/

Freeality (an all-in-one site that provides links to numerous lookup services)
www.freeality.com/findet.htm

Google People Finder
www.google.com/help/features.html#wp

Infospace (a good place to start)
www.infospace.com/

Internet Address Finder (e-mail directory; my last visit to this site crippled my browser, so be warned)
www.iaf.net/

KnowX (lets you search public records for free or for often-nominal fees)
www.knowx.com/

MapQuest (enter an address and get detailed driving directions from your place to theirs)
www.mapquest.com/

MESA E-mail Locator (find e-mail addresses; interestingly enough, I found 10 matches for my own name, none of whom were me)
mesa.rrzn.uni-hannover.de/

Payphone Project (global index of payphones)
www.sorabji.com/livewire/payphones/

PeopleSite (free worldwide BBS that allows people looking for each other to post messages in various areas)
www.peoplesite.com/

Real White Pages (not only phone and address info, but you can even find neighbor listings with similar addresses)
www.realwhitepages.com/

Switchboard (large Yellow and White pages listing)
www.switchboard.com/

Teldir (international white/yellow pages directory)
www.teldir.com/

The Ultimates (large meta-finder site, with white and yellow pages, e-mail directories, and a trip planner)
www.theultimates.com/

Video Yellow Pages (multimedia-enhanced business search engine)
www.vyp.com/

WhoWhere? International Directory Links
www.whowhere.lycos.com/wwphone/world.html

WhoWhere? Personal Home Page Lookup (find your target's home page along with address, phone, and e-mail info)
www.whowhere.lycos.com/

WorldPages (comprehensive American and Canadian database with links to global Internet directories and map makers)
www.worldpages.com/

Yahoo! People Search (formerly Four11; not the best directory, but a strong source for e-mail addresses)
people.yahoo.com/