MSN Optimisation
MSN is a fairly large search engine with a far reach and only comes second to Yahoo and Google. However, optimisation of MSN is not that difficult compared to the other two.
MSN focuses more on keyword density and quantity of links rather than the quality of links.
This is emphasized by the number of websites getting number 1 spots with a small amount of inbound links.
MSN is also one of the fastest search engines to include a website in their index and rank the pages. This is why most webmasters see traffic only from MSN in the early days of a website, then gradually start seeing traffic from Google and Yahoo in the following months.