What search engine optimization techniques have worked for you, in getting your website to the top of the top search engines?

Relevant backlinks from good PR ranked sites.

Clean semantic code that Google can read easily.

Key word research which is then used to build good quality, readable content, not a pile of hidden keywords stuffed into the page.

Headings used properly.

Title and Description present and correct

Correct Doctype

Google XML sitemap.

Getting my link or content somewhere on a bigger, more established website.

Andesine has given an excellent comment above.

Also, be sure to see that your website pages have plenty of quality content, and that the words for which you would like your site to be found are repeated a few times in the content, but not too many of them either! Use synonyms where possible too. I also don't use flash or include too many images. Search engine spiders look for text not images.

Squiddo is very good if you use keywords for your URL. Don't forget to bookmark your article and promote it.

Social Bookmarking and Directory Submission for a start. But, apart from this Blog Commenting, Article Submission, Active Blooging, etc. are of equal importance.

So many search engine optimization techniques are presenting a very positive results for my site. They are article marketing, email marketing, blog posting and RSS feeds..