Same here....knew about it and assumed everyone else knows about it too.
I think a lot of good stuff remains hidden because people never really 'reach' them.
And the ones who know about it, don't care to keep reminding people, since repetition sounds weird and is frowned upon amongst us hackers.
(On a sidenote) Interestingly enough, revision/ repitition is how our minds remember things too. So, in some cases, things we know exist, are bound to be forgotten by us, if we don't spread the news, regularly.
I know I have definitely forgotten many of these "interesting, i gotta read it sometime later" websites.
Hey, maybe we should make a Bot that keeps sending others info about these kind of sites that we know, and dont share much, so that once someone else knows about it....slowly it still keeps spreading , instead of just dying and never reaching a lot of audience, until way later....