That Scorpions cover kind of slipped under the radar on a (mostly) Best Of album called "Comeblack", which they released in 2011. (After doing one of those "farewell not farewell" tours everybody loves LOL.) It's mostly remasters of old hits, but Tainted Love is on there, along with (I'm just finding out) All Day and All of the Night. Same uber-heavy guitar treatment, but IMO it doesn't work well as it does for Tainted Love.
I love Bill Withers, and this Zakk's cover is great! I dig the video, too. :)
(Listening further, the Kinks cover is better than I expected... so here.)