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Henri Picciotto's Math Education Page
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All three books are available free for your non-commercial use.
These are companion manipulatives to Geometry Labs.
Three lessons on algebra as part of Teaching Mathematics with Manipulatives, an in-service video course (Ed Dickey, editor.)On this site: The Lab Gear.
Articles in The Mathematics Teacher:
With Jonathan Choate, "Iterating Linear Functions" (February 1997), an introduction to dynamical systems.
"Make These Designs", a graphing calculator lesson on linear functions (May 1996).
Also: Delving into Functions with Function Diagrams in NCTM's online journal ON-Math (Volume 5, #1, 2006-2007).
On this site: Function Diagrams