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 posts, etc.), but since I know not everyone is using those services, it might be useful to post the best-of-the-selected here once a week. Why Thursday? Somewhere long ago I read that Thursday at 11am is the best time to put a post on a blog because Thursday lunch through Friday are the most active time for readers. I have no idea whether that is true or not, but lacking any evidence to the contrary, Thursday morning will do fine. (Obviously I’m a little late on this first one, but I’ll try to do better next time. Or not — maybe this will be a one-off weekly thing.)