Jim, after seeing/hearing this, I am ruined for the Cream or any other version! Very cool find, I love this.
You likely saw this version on YouTube, which at first contains just some cool old pics of Skip and some pals, but then they slipped in some of the video footage which was taken from the '66 video you posted. Funny thing is, since this YouTube studio version is played at a faster clip, the guy who dubbed in the video also sped up the footage to slightly fast motion! It's pretty funny actually. The guitar work in the studio version (YouTube) is excellent. Although I really like the falsetto vocal in the one you posted. Thanks Jim!
http://www.youtube.com/watch?v=yWLycl7q9XU
JoeMan