Tweet

Google / AOL / Netscape - http://www.google.com/addurl/?continue=/addurl
Yahoo / AllTheWeb / Lycos / Alta Vista / Inktomi / HotBot / MSN / Bing - http://search.yahoo.com/info/submit.html
Gigablast - http://www.gigablast.com/addurl
EntireWeb - http://www.entireweb.com/free_submission/
ScrubTheWeb - http://www.scrubtheweb.com/addurl.html

dmoz - open directory - http://dmoz.org/add.html

Or perhaps try this free service: http://www.freewebsubmission.com/
Or alternatively, try this one: http://www.submitexpress.com