Well, between the three of them, we know that Rita became the Mystic Mother (as seen in the first comic above, I assume that's Mystic Mother). And I know in one of the tie in games for the Playstation Lord Zedd became evil again (Not sure of that counts). No idea what happened to Divatox.

For those guys, I would assume since they weren't utterly disintigrated by Zordon's ultimate Goodness wave like all the other Pre Lost Galaxy villains, everyone assumed they were harmless and not worth going after (I mean Hell, when Rita and Zedd got purified they started dancing. It seems to imply they have no memory of their past evil selves.