Lots of these, but wanted to make a note about the Manchester District Music Archive: http://www.mdmarchive.co.uk/
Seem to lots of these popping around music. But then, also I think around lots of areas in which there are enthusiasts. Areas in so-called nerd-culture too. I should go back to my notes on that session on this topic at . . . SAA, I think it was. That was a great session.