My favorite freebie so far is my writing innovations pack.
It's my favorite because I love, love, love writing workshop. It helps struggling writers come up with ideas and feel successful, but eager writers have a lot of fun with it too. I can easily get 7-10 days of writing out of my students with them too so they're great for the beginning of the year while I'm working on benchmarking my new students.
The story behind them is pretty simple. My blog was still pretty new and I wanted to do a series of posts with ideas for my followers that were near and dear to my heart. Of course I chose writing! You can see all of those posts here: http://msfultz.blogspot.com/search/label/innovations.
You can use these innovations several ways. I use them as 1-2 day lessons. I read the picture book and have students do some brainstorming on day one. We spend the second day writing in our little books and polishing our work. The books can stay in students' writing folders for the the entire unit and they can circle back and work on the various books as we build stamina for writing workshop.