It's created, and being run by RichardP.
It is configured to check kayakwiki for spam every 2 hours.
This is does not mean the end of Wiki Spam, but its certainly a useful contribution! If you see spam you are still encouraged to revert the edit. In the recent porno spam attacks, the number of pages hit meant that this bot was the only feasible way to clean it all up. In such cases you might like to revert just the more prominent pages (e.g. HomePage) and leave wikiminion to do the rest.
Discuss wikiminion: /Talk