The SEP article on Wilfrid Sellars has been updated with the addition of more internet resources. This is despite the passing of its author a while back. In any case, one of them appears to be quite nice. There is a link to a .pdf of some lectures given by Sellars at Notre Dame. The dates listed say 1969-1986. The document itself is 447(!) pages. It looks promising. Here is a snippet from one of the lectures, quoted in the introduction.

One of the basic tasks that philosophy has to do is to raise questions to open up conceptual possibilities… philosophers should not regard themselves as merely owls of Minerva who come back in the night after the day is done. They should also be “heralds of the dawn” who create the categories in terms of which science is rejuvenated.