Matt Cutts, Google employee, has been taking search questions and answering them via video. I wrote in and asked if Google treats blog sites any different than regular websites and he said no.
The thought behind my question was that with more sites converting from static HTML to WordPress or MovableType, the sites are becoming more complex. There are posts, pages, feeds, comments and comment feeds. I wasn’t sure if Google saw these sites any differently than a static HTML site.