I think this particular wiki is open for those who want to add and contribute. I took upon myself the job to keep all the scripts updated, but I keep wishing there was someone who could do the same for the searches. I did the scripts because I had been keeping track and recording all the posts that included a script. If someone was to do the same for the searches, they would have to go back to the beginning of this particular forum and go through every post keeping track of every post that included a search. I do not know if there is an easier way to get it done. Whoever gets it done, might also have to figure out how to organize and categorize those posts; because I noticed that most of those posts include several search syntaxes. Heck, if you want to get started with November, I will do December, and maybe someone else pitches in so that we finish a lot faster.
EDIT: Here is my December list. I can do this while I watch some Tv. I will get started on February.
December
http://support.hogbaysoftware.com/t/is-there-a-query-reference-guide
http://support.hogbaysoftware.com/t/filtering-with-projects-and-tags
http://support.hogbaysoftware.com/t/moving-between-sidebar-and-outline
http://support.hogbaysoftware.com/t/retain-line-focus-while-removing-filter
http://support.hogbaysoftware.com/t/filter-filtering-when-is-a-search-not-a-search
http://support.hogbaysoftware.com/t/larger-search-text-area
##February
http://support.hogbaysoftware.com/t/selective-archiving
http://support.hogbaysoftware.com/t/cannot-make-an-search-from-a-valid-search
http://support.hogbaysoftware.com/t/tag-with-multiple-values-chapter-1-2-7-14
http://support.hogbaysoftware.com/t/how-do-you-use-dates-again
##March - April
March - April
http://support.hogbaysoftware.com/t/what-modifier-to-focus-on-branch
http://support.hogbaysoftware.com/t/duedates-script-for-taskpaper-3
http://support.hogbaysoftware.com/t/whats-missing-in-taskpaper-3-preview
http://support.hogbaysoftware.com/t/search-syntax-question-showing-child-items-only-if-its-not-folded
http://support.hogbaysoftware.com/t/recurring-tasks
http://support.hogbaysoftware.com/t/done-tag-not-filtered-as-expected
http://support.hogbaysoftware.com/t/how-to-do-not-searches-in-taskpaper
http://support.hogbaysoftware.com/t/how-to-show-all-items-that-dont-have-any-tags
http://support.hogbaysoftware.com/t/editorial-worklfows-for-regex-matching-past-and-todays-date
http://support.hogbaysoftware.com/t/saved-search-notes-and-lists-outside-projects
Including this last two because they affect searches 
http://support.hogbaysoftware.com/t/bug-pathological-edge-case-for-the-tag-matching-regex
http://support.hogbaysoftware.com/t/proposal-require-that-both-and-are-always-escaped-in-tag-values
Going to bed and read. Now if you can finish the rest, maybe we can organize them or something later