Here are the addresses of the submission pages for a dozen of the top search engines:

AllTheWeb: http://www.alltheweb.com/add_url.php
AltaVista: http://www.altavista.com/sites/search/addurl
AOL Search: http://search.aol.com/add.adp
Excite: http://www.excite.com/info/add_url
Google: http://www.google.com/intl/en_extra/addurl.html
HotBot: http://hotbot.lycos.com/addurl.asp
InfoSpace: http://www.infospace.com/submit.html
Lycos: http://home.lycos.com/addasite.html
MSN: http://submit.looksmart.com/info.jhtml?synd=zdd&chan=zddhome
Northern Light: http://www.northernlight.com/docs/regurl_help.html
Webcrawler: http://www.webcrawler.com/info/add_url/
Yahoo!: http://docs.yahoo.com/info/suggest/

Here are some search engine submission services:

Submit It: http://www.submit-it.com/
Add Me: http://addme.com/
!Register-It!: http://register-it.netscape.com/
Yahoo! Promotion Index: http://dir.yahoo.com/Business_and_Economy/Business_to_Business/Marketing_and_Advertising/Internet/Promotion/