There are some constants in search engine optimization; some factors that, by necessity, must be considered by all the major engines. These are the factors you need to play around with to make sure you get top ranking in all the search engines:

Age = the older the website, the better. There is this thing called "sandbox" where new websites are not shown until several months later

Content = you need to have content related to a similar theme. The better your content and the more original your content, the more likely other websites will want to link to you and audiences will come back to your site

Keyword density = the overall percentage of your page content that is made up of the targeted keywords. An additional factor in keyword density is the percentage of your keyword content that uses special formatting such as bold, italic, anchor text, etc.

How it fares in the results = the search engine knows when you have clicked on a result. They also know when you have returned to the results to try another site.

Site structure = The way your site is structured determines how easily a search engine spider can get through it, the priority is gives specific content, and how much code the spider has to weed through to get to your content.

Backlinks = With backlinks, as with websites in general, it’s quality that counts.

General timeline of getting your site ranked well

2 – 3 months: MSN rankings secured
4 – 6 months: Yahoo! rankings improving
6 – 8 months: Yahoo! rankings secured and Google improving. Many secondary phrases are attained on Google.
8 – 12 months: Google rankings secured.

I suggest you read the following articles:

SEO for Google http://www.powerhomebiz.com/052006/google.htm
SEO for Yahoo! http://www.powerhomebiz.com/052006/yahoo.htm
SEO for MSN http://www.powerhomebiz.com/052006/msn.htm

This is what I do for a living , I sell advertising software and I provide free advertising on my website !

Visit my website to see what it is all about …

http://SitePromotionOnline.com