I went looking for all the Supernatural Big Bang challenges I could find. Here are the best resources I used to compile my list!
http://bigbangindex.dreamwidth.org/ - Multifandom DW community; list tagged “admin: index post.”
http://strina.dreamwidth.org/410079.html -Updated list by mod of the DW comm, included big, reverse, & a few mini; current, defunct, and deleted; and (readers sit up!) masterlists for each round for each challenge! Almost entirely challenges on LJ/DW.
-Browse tags for challenges! Once you’re in the Works of a tag, you can look for if it says “Collections: 1″ in between “Chapters:” and “Comments:” under a story. This is honestly easier than trying to search for a collection in the first place. Mods, take note: prominently link to your AO3 collection so people can find it!
Hope this is useful. Without all the hard work done by everybody who worked on these lists, I couldn’t have gotten anywhere close to what I was able to do with mine!