From time to time, I'll create a 'hit-and-run website'.
My first one was Mr. Worf's Homepage (which was deleted for unknown reasons, but I've now reposted it at the original location). A link to an parody anti-Trek website was mentioned on alt.tv.star-trek.enterprise, so I wrote a page with a similar style as 'Mr. Worf', and signed the guestbook as him.
Then in 2003, a Foxtrot strip featured Eileen Jacobson complaining about Mandy Berwick who things she's so popular. At the end, Eileen shouts out 'Zero matches on Google, Mandy! Zero!' So I threw together Mandy Berwick's homepage. Sadly, though blog posts and such appeared on Google that very day, my new site didn't for a while. Oh well.
I've since written three fan sites for people I know. There may be others around, but if so, I don't remember them.
It's a fun thing to do. Advice: Freewebs is probably better than Tripod. Of course, you could use your own host,but then it's less anonymous. Blogger also could be used, but blogs are less cool than normal hit-and-run sites.