Kind of like wallwisher but shared through url and not embeddable as far as I can see. Also no moderation settings, however extremely uncomplicated for spur of the moment brainstorming session work.
"Starting today, the Newseum is testing a watermarking system to prevent illegal downloads of the newspaper front pages.
Through a special agreement with more than 800 newspapers worldwide, the Newseum displays these front pages each day on its website. The front pages are in their original, unedited form, and some may contain material that is deemed objectionable to some visitors. Discretion is advised."
"This JavaScript tutorial contains hundreds of "Try it yourself" examples.
With our editor, you can edit JavaScript code online and click on a button to view the result."