Found a great article on SearchEngineWatch.com by Eric Enge entitled How Long Does it Take a New Site to Rank in the Search Engines?
Eric plans on continually analyzing a new site across all of the major search engines (Google, MSN, and Yahoo) in order to learn more about the time it takes for sites to rank as well as gain incite on the algorithms and methods used to rank sites.
The site he is testing, Follow the Drinking Gourd, was first published by Joel Bresler on January 17, 2007.
So far one thing is absolutely apparent, Google weights time (how long the site has been around) much more than the other two engines.
From this data, it looks like Yahoo and MSN are much faster to accept what their crawler finds (in terms of content and links) at face value. Google is much slower to do so. This is consistent with the general industry belief that Google puts more weight on temporal factors, and needs to build trust in a site before giving it higher rankings.
Because of its algorithims which are good at eliminating spam from its index, Google is inherently slow in the adoption of trends and new site content.