I have contributed my generalizability functions to the QME: Quantitative Methods in Education 
package. I described my efforts in an earlier post. This project continues to be a great learning experience for me, especially in terms of seeing how classical test theory, generalizability theory, and multilevel modeling overlap. I will probably submit a proposal to demonstrate the package at either NCME or AERA in 2014. You can use the following commands to install the package:
library(devtools)
install_github("QME", "zief0002")