TiddlySnip:

The TiddlySnip development team is looking for developers. Previous knowledge or experience of XUL is NOT a requirement. If interested, please contact lewcid at gmail.

TiddlySnip is a firefox extension that aims to facilitate saving text to your TW, primarily from your browser. It's as simple as select some text, right click, and choose "TiddlySnip Selection". Each selection is saved in a new tiddler.

For more details and to grab the latest version, head on over to TiddlySnip.com