If you are interested, here is a link to the slides (except for the picture of the money order) from my talk at the 2006 Stanislaus Math Conference on January 28, 2006. The file is in
DVI format.
Right-click here and choose the save option for a Mathematica file for Riemann sums.
If that doesn't work, try this one.
Click here to access the web page containing the files for the CSU Stanislaus
2008 Summer Academy
on Preparing Women for Mathematical Modeling and Robotics.