I hadn't made much of an attempt to explore the depths of YouTube, but since discovering VideoSift it's become easier to find the good stuff. They cull the good stuff--from Google Video as well--and highlight it. RSS it. This is how I discovered such videos as this mad crazy dulcimer guy and this surprisingly affecting acoustic cover of "Hey Ya". Other fave vids (found elsewhere) include this new-to-me Miyazaki short which brought me nearly to tears and this illuminating discussion of Pokemon taxonomy.