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At jiskha.com, a student can get homework help in any subject area and grade level. You can view recent questions that have been asked and either post an answer yourself or view other's answers. For the music section, there were quality, complex questions regarding composers, instruments, styles of music, music history, and more! Students can also chat with live on-line tutors. The site features a homework help reference page which includes links to dictionaries, encyclopedias, maps, almanacs, etc. I think it might be a fun assignment to have my students develop a question regarding a topic we are studying, post-it, and report back to the class with answers they received.

Backchannel creates a temporary chatroom that lets participants talk to each other.  Sort of like twitter, only just for that event.