Disclosure: I received a free copy of this, in both print and pdf format, from the publisher.
Similar to the zine indexes in The Gong Farmer's Almanac, and compiled by the same individual, this is an index of adventures, creatures, spells, NPCs, magic items, patrons, and more, from every Goodman Games DCC product up to December 2016.
If you are looking for stats for, say, a polar bear, or a cougar, or a riding moth, this index will help you find it. If one of your PCs picked up the axe of Felan, and you can't remember where he got it, this index will help you. If you're looking for patron information on the Horned King, this index will help you.
In general, if it is in a Goodman Games product, and you are trying to find it, this index can help. The exceptions I noted were 50 Fantastc Functions for the d50 and the 2nd printing of GM Gems, both of which do contain explicit Dungeon Crawl Classics content.
Get It Here!