Dear Aunt TUAW,
I've been trying to figure out if there is a way to add a URL to Reading List from outside of Safari, i.g. right-clicking a link in a Twitter post and using an Automator action from the services menu, etc I don't see ANYTHING in Automator or AppleScript about Reading List. This seems very stupid to me being that the only way Reading List has a chance of getting used instead of Instapaper is to throw things into it from every possible browsing location. Have you come across anything yet?
Your loving nephew,
Dan B
