Submission in Google, Yahoo, MSN

Without listing in search engines, we donot expect traffic to our website. So it is better to submit our website in top search engines when the work has finished. But sometimes google, yahoo and msn search engines crawl the website without submission. The crawler read the address somewhere else and crawl the website. If you have inbound links or if you submitted in the directories or in article sites then it can be possible else not. So better if we manually submit it in the search engines. As we all know about Google, Yahoo and MSN. Sometimes it is very difficult to find the exact page for submission for the fresher. So I want to write here the exact location where you can submit your website directly in these search engines :

Google - http://www.google.com/addurl.html
MSN - http://search.msn.co.in/docs/submit.aspx?FORM=WSDD2
Yahoo - http://search.yahoo.com/info/submit.html(Must have yahoo id to submit website)