Where to Find the Best Free Photos and Graphics is a collection from the Site Builder web site.
Internet Safety Cheat Sheet is a great guide for parents trying to maneuver the ins and outs of social media.
Google has published a small collection of classroom lessons for Digital Citizenship. Check out the Google Digital Literacy and Citizenship resources.
Digital Passport by Common Sense Media takes students through a series of lessons on cyber safety. When they complete the learning modules, they receive their digital passport.
Here is a nice collection of parent permission slips for technology use put together by Vicki Davis on Cool Cat Teacher blog. Several are excellent to modify for middle and high school students.