This site from Jostens Yearbooks is good.
This site from Taylor Publishing covers lots of good stuff, including themes and a design gallery.
This site from Walworth Yearbooks is also good.
Another site from Jostens.
The Creative Process This site could be a good way to get kids to think creatively. Write and think out of the box, not "the way we've always done it."
Cliches can kill good copy. This site tells us how to avoid cliches. Kids often don't know what cliches are; thus, how can they avoid them? It's a fun read.
This site gives 30 tools for better writing. That can mean better yearbook copy.
This site will prepare your students to write accurate and complete cutlines (or captions) about who, what, when, where in the photograph.
This site (although it is for newspaper, it can still be used for yearbooks) tells how to set up a stylebook. This gives students a way of knowing what type to use, what size, what weight, etc., Thus, the headline type, the cutline type, the copy type will be consistent and students can refer to the stylebook to find answers to their questions.
This site is for LifeTouch Yearbooks.

Critiques available. E-mail Chet Hunt at  cfhunt@gmail.com