Adding my kudos on the awesome posts here - great stuff!
Also, all the KISS songs just put up over at the Fallon site are worth checking out- nice close footage of the original line-up doing their thing.
Their performance of Black Diamond from that set sums up IMO what's great and what's terrible about KISS. Paul Stanley still fumbles through that soft picking guitar intro. like a 16 year old with his first tab book. Then he stops like 5 times to remind the audience "doesn't that sound good!" But once they kick in, whoo-boy that's mighty fine rockin'.