Other suggestions for 0-click infos:
If I type a telephone number, it should look for it.
Example:
If I type +390331463811, 00390331463811 or 0331/463811 DDG should look for this telephone number in the following website: http://www.paginebianche.it (for Italian telephone numbers).
Site:
http://www.paginebianche.it/execute.cgi?iq=&ver=default&font=default&btt=1&mr=10&rk=&om=&qs=0331463811&dv= (+39 is the Italian code so it shoul be deleted).
In this official website there aren't all Italians, because everyone can add or remove their number on the site and on the book, yearly updated. So there's no privacy problems.
DDG now thinks that I asked for a sum, which is calculated by WA: http://duckduckgo.com/?q=+390331463811

The second suggestion is quotes from religious texts (even if I'm a proud agnostic)
Ex. http://duckduckgo.com/?q=Mt+1:3-5 should look for the Bible quote
Here there are some links to Bible)
* http://www.laparola.net/wiki.php?riferimento=Mt+1:3-5 for Italian speakers
* http://www.biblegateway.com/passage/?search=Mt+1:3-5
* http://www.biblegateway.com/passage/?search=Mattew+1:3-5
http://duckduckgo.com/?q=Quran+3:72-73 should look for the Quran quote
* http://quran.com/3/72-73 (this is the first link I get)
Other languages could be added (There is a box called Other languages) but I don't know if it is possible to change it in the URL through a parameter