Obama's new Web site for the transition
change.gov
change.gov
Personally, I’m a fan of redirecting www to the root domain, but anyway.
There are many "SEO experts" who swear that the opposite is true (which goes to show you the value of "SEO experts," but I digress.)
Seriously...this is web-crawler 101. I think the search engines have it covered.
I've the done tests myself, and never found a difference. The link you've provided suggests much the same thing -- as long as you're being reasonable in your use of subdomains, you're not going to be penalized by the search engines.
I posted the URL on Tumblr a few hours ago and already had 7 people reblog the link. That's one isolated instance. This'll be passed on quickly.