I found one interesting on how Google fail to embrace SEO when they release the new content. What Google usually do when they have new section, they either created on sub-domain (widget.google.com or www.google.com/widget). But I found Google Zeitgeist for this year (2011), they created the new domain name (http://www.googlezeitgeist.com). As the result when you search for "Google Zeitgeist" in Google.com, this new content is no where in top 5. I have checked the ranking of this site, it ranks #10.
Can anyone tell me any reason why Google need to use microsite (new domain) instead of keep using their sub-directory as they always do in 2010, 2009, 2008?