What concordances are there for the Pali Canon? I am amazed at how quickly folks on this SE find detailed quotes from the canon.  Are folks using a concordance?  (That's what Christians call it for the Bible--it's a dictionary of topics cross-referenced to the source text so that it's easier to look up passages by subject.) 

If there is a concordance for the Pali Canon, where can it be found?
Here's a list of terms in the Pali Canon that can be used to quickly find particular suttas:

http://www.accesstoinsight.org/index-subject.html