Do we need this in Mountain Lion 10.8.1. ?
Great. How do I remove it (it's not located in the applications/utilities list), I installed it when the recent malware/hacking was in the press. It installed on Mountain Lion.
I'm guessing that your are referring to one of the Flashback Malware Removal Tools, but you didn't really tell us that.
If so, then it removed itself after checking and not finding anything. It's a one-time thing.
Also, Flashback has not been observed for several months now, so it's should probably not be of any concern to you. If Apple determines that you need it you will find it posted as a Software Update. There should be no need to download it again.