AskERIC lesson plan available at:
(Counting Fun With Gummi Bears)
http://www.askeric.org/cgi-bin/printlessons.cgi/Virtual/Lessons/Mathematics/Arithmetic/ATH0028.html

Alternate lesson plan available at:
(A Teaching and Activity Guide for Hooray For Diffendoofer Day!)
http://www.randomhouse.com/seussville/titles/diffendoofer/guide.html

Listserv available at:
http://www.nea.org/helpfrom/growing/works4me/library.html