Lookup for those four number websites (like 4.4.16.25)
http://www.arin.net/whois/index.html

Europe websites DNS Lookup
http://www.ripe.net/perl/whois

US Government websites DNS Lookup
http://www.nic.gov/

US Military DNS Lookup
http://www.nic.mil/dodnic/

Internic (international) DNS Lookup
http://www.internic.net/whois.html

Asian Pacific region DNS Lookup
http://www.apnic.net/

Various other DNS lookups
http://www.domains410.com/checkwhoisinfo516.asp
http://verisign-grs.com/whois/
http://www.networksolutions.com/cgi-bin/whois/whois
http://www.domainbank.net/whois_gen.cfm
https://http://www.droa.com/whois.asp
http://www.uwhois.com/cgi/domains.cgi?User=Default
http://www.tucows.com/
http://www.atomintersoft.com/products/alive-proxy/whois/
http://whois.ausregistry.net.au/

David's personal favorite DNS lookup server
https://joker.com/index.joker

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Google Advance Search Engines
Google Web search
http://www.google.com/advanced_search?hl=en&num=100
Google's Craiglist search
http://www.google.com/advanced_search?q=+site:craigslist.org&num=100&hl=en&lr=&safe=off&as_qdr=all
Google Image Search
http://www.google.com/advanced_image_search?hl=en&num=100
Google Scholarly papers search
http://scholar.google.com/
Google USENET newsgroup archives
http://groups-beta.google.com/advanced_search?hl=en&safe=off&num=100&
Google Advanced News Headlines search
http://www.google.com/advanced_news_search?hl=en&num=100

People who gave money to the 2004 campaigns (really fantastic private data for bigwigs)
http://www.fundrace.org/neighbors.php

Old USENET database for July 1991 and February 1996 data
http://usenet-addresses.mit.edu/

Collective of links to places to find people using the internet
http://www.nettrace.com.au/resource/search/people.html

Sotheby's search for priceless art and artifacts for sale
http://search.sothebys.com/search/quickSearch/k2/Search.jsp?coll=liveOpen

Amazon advanced internet search
http://a9.com/-/search/advSearch

All the Web search
http://www.alltheweb.com/advanced

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Find EBAY user feedback for handles (enter their email address to this link after the equals (=))
http://cgi2.ebay.com/aw-cgi/eBayISAPI.dll?ViewFeedback&userid=

The ULTIMATES people finder
http://www.theultimates.com/

Ancestry info database
http://boards.ancestry.com/mbexec?htx=advancedsearch

Benton County Property Assessor data
http://bentonpropertymax.governmaxa.com/propertymax/

All WA State Employees incomes
http://lbloom.net/

The Social Security Death Index (lets you know if someone is really dead (try Elvis Presley))
http://www.ancestry.com/ssdi/advanced.htm

Top executives in the UK
http://www.applegate.co.uk/indexes/people/all-a.htm

Resource Discovery Network
http://www.rdn.ac.uk/

US West Dex online
http://www.DexOnline.com

Free people search
http://www.reunitetonight.com/

If you go to this link:
http://www.reunitetonight.com/FreePeopleSearchAgent_v1.exe
You can download a program that will give you addresses and phone numbers for possible matches for people you're seeking.

US Search (people finder)
preview.ussearch.com/smepreview/preview.jsp

Celebrity email addresses
http://celebrity.addresses.com/celebrity_email.php

Darwin Awards search
http://darwinawards.com/misc/search.html

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To add your website (or book site) to internet linkage databases
http://dmoz.org/add.html

Server information for domain names
http://www.rjlsoftware.com/software/internet/iserver/default.shtml

NADA used book values for cars, etc.
http://www.nadaguides.com/

Invisible Web access point
http://www.invisible-web.net/

US Governmental Survey data lookup
http://data.geocomm.com/

Better Business Bureau lookup
http://search.bbb.org/results.html

Babelfish Universal translator
http://babelfish.altavista.com/translate.dyn

Swahili to English dictionary
http://www.yale.edu/swahili/

Polish to English
http://www.poltran.com/

Nearly all internet translation sites used from one site.
http://translation.langenberg.com/

If you add a Yahoo handle to the end of this link, it will find you that person's profile page.
http://edit.my.yahoo.com/config/show_identity?user=

Allows you to anonymously surf the web through their servers (great for doing research on HATE groups)
http://www.anonymizer.com/

Internet Traffic data
http://www.internettrafficreport.com/main.htm

Internet Broadway Database (for info about shows, actors, theatre, season, etc.)
http://www.ibdb.com/default.asp

A place to sign up for free trade publications
http://jobnewsletter.tradepub.com/

A great source to the people by the people for the people in various cities around the US
http://www.craigslist.org/

TriggerStreet, where to upload a 10 minute movie and get reviews
http://s1.triggerstreet.com/gbase/Trigger/BioRight?oid=oid%3A107794

Online dictionary and thesaurus
http://dictionary.reference.com/

List to all the unlisted adult discussion groups at Yahoo
http://www.bitchnporn.com/club-list/

Database of continuity errors in movies
http://www.moviemistakes.com/search.php

Reference of financial terminologies
http://www.investorwords.com/

All sorts of cemetary burial data (especially in US, Washington counties)
ftp://ftp.rootsweb.com/pub/

Entertainment Management Association at UCLA website
http://www.anderson.ucla.edu/zone/clubs/ema/WebsitesText.htm

Online Talmud
http://www.come-and-hear.com/talmud/index.html

Online maps
http://maps.yahoo.com/

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Reverse Zip Code lookup
http://zip4.usps.com/zip4/citytown.jsp

Reverse Phone Number lookup
http://www.infospace.com/info/revphone.htm?&actnav=org

Reverse Street Address Lookup
http://www.infospace.com/info/revemail.htm?&actnav=org

Reverse Area Code Lookup
http://www.infospace.com/info/npa/npa.html?&actnav=org

Reverse Email Address Lookup (not that accurate)
http://www.infospace.com/info/revaddr.htm?&actnav=org

Universal Currency Converter
http://www.xe.com/ucc/

UPC (bar code) lookup
http://www.upcdatabase.com/

Universal phone lookup page
http://www.reversephonedirectory.com/

Anywho (AT&T) reverse lookup
http://www.anywho.com/rl.html

Find US Postal Zip+4 and Zip+7 data
http://www.usps.com/ncsc/lookups/lookup_ctystzip.html

All Area Codes lookup
http://members.dandy.net/~czg/lca_index.php

Universal Directory Assistance
http://www.daplus.us/

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Find drivers for any hardware
http://www.driversguide.com/

Find Sound Card drivers
http://www.soundcard-drivers.com/