The LA Times says that "there was no evidence that Wednesday's mailings were connected to the hacking" ("a cyber attack last week"), though I suspect the mailings were from somebody participating in the "Anonymous" "war" on Scientology.
If they happen to catch the people behind the hoax, I won't have sympathy for them.
The San Francisco Chronicle reports that a married couple in Stockton were incorrectly targeted for harrassment on the belief they were pro-Scientology hackers.
The Scientology main website has been moved to Prolexic Technologies, a company that sells a service to filter denial of service traffic.
"Google bombing" has been used to make the Church of Scientology's website the top Google search result for "dangerous cult" and Xenu.net the third result for "Scientology."
The Economist has now reported on the battle, under the title "Fair game."
The Wikipedia page on "Project Chanology" is a good place to keep up-to-date on the events of the latest Internet battles involving Scientology.