The order of magnitude message board can be accessed here.
A how-to guide for using order-of-magnitude estimation in the classroom [word doc] (developed and edited at each workshop session).
Slides from Debbie French’s talk at the 2nd Dartmouth workshop. [ppt][pdf]
Here are electronic versions of materials handed out at the workshop, along with some other resources:
Fermi Question Guide (and sample problems), by Lloyd Abrams
A video guide to orders of magnitude:
(During this lesson, students are asked to sort images – you can find them
here).
A video guide to OoM estimation problems: