1) Submit your URL to major search engines.
For google go to
http://www.google.com/addurl/?continue=
and
http://base.google.com
for yahoo go to
http://search.yahoo.com/info/submit.htm
for msn it is
http://search.msn.com/docs/submit.aspx

2) Add meta tags..i.e. keywords describing your website in meta tags.
3) add more incoming links to your website from other websites.
4)Share your website links with similar sites.
5) Do have a sitemap.
6)Prefer static html wherever possible.
7) One tip, which is less known that make a lot of pages like your index or default page and have hidden links to them all over your website
Create Error-free and static HTML as far as possible
9) Submit your site to good directories like Yahoo, DMOZ.org, zeal.com
10) Write a blog for your site
11) Make a robots.txt file and put it in the root , containing name of all the searchable web pages i your website.