Good resources for science writing/speaking?

For a psychology graduate class I'm teaching this fall (on speaking/writing for general audiences), I'm trying to create a list of good resources on writing, speaking, and blogging about science. I'm hoping that you can help. 

I'm particularly interested in finding good discussions of the value and risks of blogging, suggestions for best practices in writing/speaking, etc. Do you have a favorite go-to source for such advice? Do you know of helpful resources for beginning science writers and speakers? If so, please leave them in the comments (or send them to me directly). I'll compile the full list and will post it here.