No, not Muppets! MUPPETS! The Multi-User Programming Pedagogy for Enhancing Traditional Study
http://delivery.acm.org/10.1145/950000/947143/p100-phelps.pdf?key1=947143&key2=1232732801&coll=portal&dl=ACM&CFID=20423645&CFTOKEN=51573875
http://muppets.rit.edu/muppetsweb/about/index.php
"As part of the MUPPETS system, however, this code can now control objects in a shared virtual world very much like an online massively-multiplayer game that many prospective students are already familiar with. Upper level students also populate the system in a structure of their own, and this population will be aimed at encouraging and rewarding student engagement and peer knowledge-transmission."
Azelda