Not an "online" source, but center freqs are listed toward the back of the
FAA's Airport/Facility Directory.

Receiving a FSS/HIWAS/TWEB/ASOS/AWOS via a VOR is explained in the sectional
chart legend (Radio Aids to Navigation and Communication Boxes).

-0-
JL

"Roger Long" om wrote in
message ...
I'm about to make my first cross country outside of our comfortable New
England airspace where flight following is pretty much automatic and you
just keep tuning in the next frequency they give you.

I'm not sure if things will be the same out in the wilds of western New
York
and Ohio. Can anyone point me to an online source where I can brush up on
the things I learned and forgot a few years ago, how to receive on a VOR,
how to raise center out in the boonies, etc?

--
Roger Long