Spaaze is free (at this point)--cork board that can be used as a display board--video, mp3, digial images and more. Might work well for a project summary (group or individual).
Glogster is an online FREE interactive poster tool. Ability to add hyperlinked video, insert digital images and voice (mp3)--lots of ways to personalize. Great potential (e.g., introduce self in course, individual book reports, group projects). EASY to use.
I just found this this week!! I love it. I think I might use it for our WWII unit, or disUtopian book reports, or as a culminating activity for my postcards from the past/postcard to the future workshop! So many uses!!