The Penn State Symposium for Teaching and Learning with Technology is both an annual event and a year-round online discussion of ways that faculty are using technology to enhance teaching, learning, and research.
Visit the full conference website at http://symposium.tlt.psu.edu
Piazza.com is an interactive online Q&A platform that gets students collaborating to answer their peers' questions. Answers are built and edited, wiki-style, by multiple individual students. Answers can be endorsed as "good" by students and the instructor to ensure quality control.