A lot of good stuff here--thx. Finding good provider/APIs/databses is often the barrier, and then time.
--nutrition: this is in there now via WolframAlpha, e.g. http://duckduckgo.com/?q=calories+2+eggs
. I'm not sure I understand the conversion request, but that should be also be able to be handled by WA. If you show me some queries, I could try to get them to work.
--wikia: I actually have a lot of the biggest ones already indexed into 0-click already; about 20 of them I think. If there are particular ones you're thinking about, just let me know.
--thumbnails: I started adding them to the right of search results via the embed.ly API. I'll ping them about comic sites. I wonder though, are people finding these useful?
--parts & models: I was planning on doing this via the Amazon API. I presume they cover most of the kind of things you're searching for?
--compiler/cpu: can you give some examples here?
--music samples: like this. But how would it come up; when you search for a song name?
--financial data: oft request and something I need to do. I may pull this in from WA. Is the data they provide satisfactory?