If I recall correctly, Yahoo was originally a hand curated site list sorted topically. Seems like something similar could be a "search" solution for the slow web, potentially wiki style with nomination of an entry for inclusion in a topic and a certain number of votes from validated users/editors to add it to the directory. Could even be done via Lemmy/Mbin as the front end on an instance where only local members votes are counted towards the total and you have to apply to join with some kind of vetting process.
Reminds me a bit of Citizendium