I know this isn't quite what you're looking for, but I use Zoodles when I let my kids use my Arc. If you add a browser, you can't pin anything to the tapestries, but you can save bookmarks within the browser. I'm sure there are other kid safety-mode apps you could try out.
Originally Posted by andreib
Maybe this is not something very common, but I would really appreciate a feature to lock the configuration of the tapestries (create/delete/rename of tapestry, reposition/delete of pinned items) and allow only pinning new content.
My Arc is being used by several persons, younger and older, and at the end of the day I find new tapestries added or merged by mistake, items moved arround, etc.
Or maybe this will be solved by getting multiple user accounts support with a Jelly Bean integration