I love Radiohead as a band but I especially love Radiohead as a purveyor of strange twisty websites. They used to completely change it with every album and they served as sort of a complement to each one, but also totally stand on their own. Their current site links to most of the old ones but in a way that's kind of hard to find. Here's one of them:

http://archive.radiohead.com/Site4/

There's a sincere Geocities link in there! Happy clicking!