TeachEngineering
Teach Engineering: Keep It Hot!
Student teams design insulated beverage bottles in this challenge, and test them to determine which materials work best at insulating hot water to keep it warm for as long as possible.
PBS
Pbs Kids: Conduction Countdown
PBS offers an experiment that kids can do at home to learn more about heat conduction and how it works.
Georgia State University
Georgia State University: Hyper Physics: Thermal Conductivity
Lists thermal conductivity values for a variety of topics. The link "Heat conduction discussion" on this page displays an equation for calculating the rate of thermal conduction using these conductivity values.