If you haven't heard about this already, then I encourage you to check out LINKwithlove. It is an awesome initiative started by Kal Barteski - one of my favorite bloggers - after she discovered some of her artwork was used - a lot - without her knowledge or consent. LINKwithlove is about respecting each other's works, words, and ideas.
Read more about it on the website. Like LINKwithlove.org on Facebook. Follow @LINKwithlove on Twitter. And always link with love.