Research about WWW error 404

Hello friends,

I am a brazilian master degree student in computer science and need help
of yours ...

I need your experiences, tests, comments, solutions, * personal opinion
* , resources and links related about:

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 "ERROR 404 - File Not Found" in www/http protocol.
or "broken links" ...
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** Please send for my email address: 
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lgarcia@ez-poa.com.br
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because i not have full usenet access or not participate of this list 

excuse my poor english , and thanks in advance,

Luis Fernando Fortes Garcia
Universidade Federal do Rio Grande do Sul - Porto Alegre - RS -  BRASIL
CPGCC/UFRGS