Bill Scott (again of Yahoo!) gives a great presentation about rich user interface design for web applications. (It has been a slow day at Andrew Gilmartin & Associates!)
The presentation also mentions the new Yahoo! Teachers "Gobbler." Gobbler is a tool panel that sits over web pages and allows you to clip content from the page for placing on a "project" page. Project are web pages that organizes web content for one or more lessons. I used it a little today and it does work. I need to use it more to see how it compares to the idea of "binders" that we tried to incorporate into AccessScience several years ago when it was built and hosted by Ingenta.