As a long time fan of TiddlyWiki I should mention the recent release of TiddlyWeb.
NEWBURY, Berks, UK, Jan 15, 2010 -- Today TiddlyWeb, the open source software package that provides the core services of a RESTful server-side for TiddlyWiki, was released as version 1.0. This long awaited version finally takes TiddlyWeb out of its beta-testing phase and provides a stable release for users and developers.
Looking forward to getting a chance to have a tinker with it soon.