Are you wondering what Pinterest is? It's a visual social bookmarking website. Because a website cannot be saved, or "pinned" unless there is an image on it, its use is a bit limited for education; I wouldn't recommend that Pinterest be your only way to bookmark websites as resources. There is no built-in copyright information involved in your pins (unless you add it yourself). I would suggest that Pin Boards are most useful first as visual inspiration, second as bookmarks. The board embedded above served as a resource for a unit on portraits.
Read about Pinterest on Pinterest for Dummies, BBC Active Using Pinterest in Education, and 16 Ways Teachers Use Pinterest.
There's nothing secret about these ideas for teachers - they will all work equally well for students!
Visual Arts students might want to look at http://www.pinterest.com/visualartIB/
Most of my pin boards are unit of inquiry-related http://www.pinterest.com/keepps/
I've found that searching within Pinterest itself for boards of interest is rather unproductive. I have gotten better results searching in Google, with [pinterest] as part of the search string.
Of course, there is pin board of ideas for using Pinterest in education