Students for Burma

...students all over the world uniting to support the monks and students leading the protests in Burma

Uses SinglePageMode and a theme based on GTD TiddlyWiki.

Japanese Haiku

I'm cheating a little since this site is not actually hosted on Tiddlyspot. But it's a great TiddlyWiki that I thought you'd like to see. From the intro:

This is a short collection of a couple of hundred Japanese Haiku. This was printed by the art book small press, Peter Pauper. In the original each haiku is accompanied by one of 59 Japanese seals. These seals are reproduced here.

The Random Haiku page is great. Check it out here plus the author's blog post about the site.

Wowsite

I'm going to start using this blog to showcase nice looking Tiddlyspot sites as I notice them. Here is a particularly good one: WOWSITE. It's a great looking World of Warcraft site in Spanish.