They are using a rubberized underlayment - on the eves (36" above the gutter - and valleys and paper elsewhere. Pretty much standard for Ohio as far as I know.
Certainteed and GAF both have the 'weatherwatch' style underlayment for the valleys and starter. Of course, you could just use paper, but the new systems are nice and easy to apply.
It is done - they are finishing up the flashing and looks like they already went thru the bushes and flower beds to cleanup. Even swept out the garage...
