Finally, the new version of the dateslider is available. Some changes:

• I moved the project to google code. From now on this will be the place where you can enter your bugs and feature requests and download the script. Besides this, there is some documentation available
• We fixed number of bugs and shortcomings from the previous version. For example, the area of dragging is limit so it is not possible anymore to drag to a place outside the box.
• A bunch of cool new features are implemented. You can now use callback functions when a user starts and ends dragging and it is possible to zoom closer when picking specific dates.

View a demo here

And for the ones who like to cook with jQuery herbs: I'm working on it