I've come across so much dope shit from these vinyl collectors that throw their entire collection on youtube it is insane on how much stuff we've never heard. It would take me years to go through it all.
DonNinja & PG023 has one of the better lists of hip-hop, I've found a bunch of old songs I used to have on cassette tapes back in the 90's when I used to record college radio shows http://www.youtube.com/user/OGDonNinja/featured
One of the more amazing tracks I ever found on youtube was:
I really don't listen to "new" Hip-Hop unless it has that sound most of us loved.. sorry, but why change a good thing.