There are a number of queries you can do from the Google searchbar; for example, if you query on a phone number, you get a reverse lookup. If you query define:word, you get definitions of that word.
In keeping with the goal of turning Google into the Swiss Army Knife of information retrieval, I wish Google would return domain name ownership results when queried with whois:domainname.com. I think this would be pretty low-hanging fruit for Google. If anyone reading this has access to Google’s magnaminous ear, please suggest it.