So the argument is .info domains have the same value as .com/.net/.org domains.
But anyone who has tried to rank a .info domain knows it does take more work to rank one of them.
Matt Cutts now confirms that if they find a particular TLD to be spam-heavy, it can affect the rankings on your site.
It's most likely that this has been a part of their algorithm for a while.
See from 37m13s