.spam, .censored, .cats, .advertisement, .blog, .web-log, .official, .spyware, .google, .squatter.
Why? See Google Blogoscoped.
Two explanation pertinent to this blog:
- "We need to separate fan sites from official celebrity homepages without fighting for domain names, so you only get the “official” domain if you’re the real thing (like .parishilton.official)." We know there have been cases in which domain name owners did not have to transfer it to a celebrity, because they used it in conjunction with a website devoted to this celebrity (but couldn't .name already be used in this purpose?)
- with .squatter, domain squatters could have their own top level domain to abuse!