Anti-Spam Web Sites
www.spamcon.org
www.spamlaws.com
Coalition Against Unsolicted Commercial Email

Reading Email Headers
Primer on tracking down a spammer's through the ISP.
Discussion on reading mail headers.
Reading a header and then using traceroute.
Shows how to see headers in Outlook (Express)

Domains and IP Numbers
ICANN Whois Data Problem Report If you are certain domain registration information is bogus, report it to ICANN
Spam Combat Nice collection of a lot of the following.
AllWhois.com provides world-wide whois searches. Enter the IP number or domain name of interest. Be aware, however, that the registrant of a domain name might be bogus.
SamSpade.org provides whois searches and other useful tools, such a running a traceroute and decoding obfuscated URLs.

Obfuscated URL's
Decoders of various URL encoding. ishweb.com/dec.htm

Phone Numbers
800-337-4194: Toll-free service from Ameritech to identify which company currently provides service for a toll-free number. By knowing which company provides service for a particular spammer's toll-free number, a subpoena duces tecum can be directed to the company for name and address of the person or organization using the toll-free number.

Fone Finder: Find city, state, from area code and prefix.

ELongDist.com: Find city, state, from area code and prefix.

Cageyconsumer.com: Long list of area code/phone number tools and sites.

Public Records
www.pac-info.com. Links to all 50 states, including corporation records.

Zip Codes
Zip Code Lookup: Find state, county from zip code.