MSN rankings are generally faster attained and thus it is a good place to begin, especially if you have a new site that is likely still in the sandbox on Google or are just at the beginning stages of link building.
The demand for experienced search marketers far outstrips the supply of really good practitioners, a situation evidenced by SEO salaries ranging from 30K at the low end to over 100K at the top.
Over the past few years Microsoft has gotten slower. Key product releases have been delayed, upper-management has been reshuffled several times in two years, defining initiatives such as the .net strategy have been virtually abandoned and worst of all, Microsoft has lived in reaction mode for the better part of the 2Ks.
