Sgt_Kickaxe - 12:33 am on May 10, 2012 (gmt 0)
Those google guidelines have issues not many agree with Lucy24, such as not using closing paragraph tags, etc.
Personally I don't think Google cares how clean your code is, they are more interested in identifying your CMS and going straight for the meaty part of the content. They also come back to the same page many times during the first few hours immediately after it is first found to see if it changes and to take note of any social signals you provide such as tweets, comments etc.
Google will, one day, no longer use or trust ANY signals your site sends besides the actual relevant text. The rest is being used less and less already.