Joost has launched a new sub-site for the soon (still...) release of the Widget framework, at dev.jooost. There is very limited information so far, but the one article there gives some insight in between the marketing buzzword:
Introducing Joost™ Widgets: "built the Joost Widget platform on top of the latest Web standards, powered by the Mozilla browser engine. Developers who are familiar with technologies such as HTML, XML, CSS, SVG, Ajax, Javascript and RDF will find an exciting new environment to develop their ideas"
Finally a step closer to realizing the promise of Joost - the best options from the internet, in the form of open-source based development acceptance (rather than leaving the users to hack for themselves with Greasmonkey or similar)
What do you want to do when watching video? How about keyword tags with linked Google search or News feeds? Geotagging for other watchers and in-show quiz? Multi-player Tetris?
Stay tuned? ;)