Grammar girl recordings is available through the Quick and Dirty Tips website. It is entertaining, and informational. I recommened it for high school and college students looking to get the last few bad grammar habits ironed out.
Titles include Is "Ain't" a Word?
Do you know when to use Affect versus Effect?
Lay Versus Lie... and
Alternate versus Alternative.
ps. If you like the website... you'll love the book