»interface«

While watching the Hot Spurls I recognized several links that pointed to something called TiddlyWiki. First I thought this might be just another free serverside Wiki and clicked to see if it could be interesting...
And: IT IS!!! WOOOWHAA! I have never seen a single HTML-page where I you can modify content in such a smart way! Damn nice animation, perfect color scheme, superb background programming and a lot of features to replace your boring desktop stickies!

A MUST HAVE: http://shared.snapgrid.com/gtd_tiddlywiki.html

Qooxdoo is an advanced open-source javascript based toolkit. It continues where simple HTML is not enough anymore. This way it can help you to get your rich web application interface done - easier than ever before.

Enjoy rich versatile widgets for your web application: Qooxdoo

Clicke here to see an impressive explample of XP-styled Windows.

BumpTop is a physically-based casual interfaces using pen-centric interactions enriching the desktop metaphor with expressive, lightweight techniques found in the real world.