Adolescent literacy.org is a resource for parents and educators of kids in grades 4-12. It's a free e-newsletter and it's got a nice balance of writing and reading resources as well as blogs, multimedia videos with experts and YA authors as well as literacy strategies.
Right now I'm watching a video by Dr. Steve Graham of Vanderbilt University. It's long, so it would be a great shot of PD for spring break. Not only does he talk about why he was interested in writing, he also says that the best preparation for writing teachers is to go through writing project.
He also talks about self-regulated strategy development, peer revising, collaborative writing and grammar instruction. He gives specific examples from the classroom, answers some common teacher questions and explains why what we do is so important.