GOOGLE:

http://www.google.tl/intl/pt-PT/add_url.html

YAHOO:

https://siteexplorer.search.yahoo.com/submit

MSN

http://www.bing.com/docs/submit.aspx

ACHEI

http://www.achei.com.br/incluir/index.htm

AONDE

http://www.aonde.com/inclusao.htm