Requested feature overview description.
The service that http://iqdb.harry.lu/ provides (when it's not down)
integrated into e621

Why would it be useful?
It would be up whenever e621 is up, and would help to reduce the number of reposts

What part(s) of the site page(s) are affected?
Search

If it can efficiently be integrated into e621 then +1. Anything that can help reduce the number of reposts seems like a good idea to me.

+1

http://iqdb.harry.lu/ is down a lot lately