This Puppet vs Chef article is a great example of a how a well seo-ed blog can affect the opinions of many. If you look at the initial article in a quick 'skim read' to choose a technology - you would conclude that Puppet is the best option. However there are plenty of comments below the article specifying why the article is FUD.  I have come across this before when reading about cassandra - I later discovered from an expert inside Yahoo! that a lot of the information was incorrect.

installing Chef on ubuntu - I will be interested to see if its better than Yahoo's internal tools for configuration management.