Thursday Threads: Print-on-Demand, Video Changing the World, Puzzling Out Public Domain, and more

I'm starting something new on DLTJ: Thursday Threads -- summaries and pointers of stories, services, and other stuff that I found interesting in the previous seven days. This is culled from entries that I post to my FriendFeed lifestream through various channels (Google Reader shared items, citations shared in Zotero, Twitter …