I re-found (is that even a word?) this website in my Delicious account- I suspect I originally stumbled across it while doing the VicPLN course earlier in the year. At the time, I thought it would be a great one to come back & explore. I still do. It contains a lot of information on Creative Commons...some of it a useful starting point for a discussion with students.
Please note that search.creativecommons.org is not a search engine, but rather offers convenient access to search services provided by other independent organizations.