Hi Prof,
and

to KivaFriends.
You may also find the materials on Microfinance (including an online course but also "offline" workbooks and reading lists) provided by the UNCDF helpful (see
http://www.kivafriends.org/index.php/topic,890.0.html or directly
http://www.uncdf.org). And some materials for high-school students have recently been added here (
http://www.kivafriends.org/index.php/topic,1220.0.html and more specifically:
http://stanford.edu/~jimr1/kiva/kiva_curriculum.html) - maybe you can use some (though probably little) excerpts from them, too.
Just one "warning": I don't know how familiar you are with Kiva already - I am pretty new myself. But as far as I understand it, in the case of many if not most loans/projects/entrepreneurs you receive no feedback during the loan's repayment term, and maybe one journal update after the loan has been fully repaid (if at all). So I think it might prove difficult to really "track" the project during the course of the semester - for a better learning experience, I would thus definitely choose (or make your students choose) a loan handed out by a Field Partner with relatively many journal updates (you can see the statistics on that on each Field Partner's page on kiva.org).
Best wishes and good luck with your project.
Please feel free to always ask questions, and to share your experiences.
Wolfgang.