Online Educational Delivery Applications: A Web Tool for Comparative Analysis http://www.c2t2.ca/landonline/evalapps.asp
A Framework for Pedagogical Evaluation of Virtual Learning Environments http://www.jtap.ac.uk/reports/htm/jtap-041.html
Also note that there are a number of threads on these boards which show a very strong synergy between a potential OpenACES port and the goals of the broader OpenACS community:
https://openacs.org/bboard/q-and-a-fetch-msg.tcl?msg_id=0001WI&topic_id=11&topic=OpenACS
https://openacs.org/bboard/q-and-a-fetch-msg.tcl?msg_id=0001aI&topic_id=12&topic=OpenACS%204%2e0%20Design
https://openacs.org/bboard/q-and-a-fetch-msg.tcl?msg_id=0001ZO&topic_id=12&topic=OpenACS%204%2e0%20Design
https://openacs.org/bboard/q-and-a-fetch-msg.tcl?msg_id=0001Zu&topic_id=12&topic=OpenACS%204%2e0%20Design