Laura Halliday mentioned this page on the QRP-L while discussing the innards of those Radio Shack “atomic clocks” that you can buy. Seems like there are some good links to helpful information regarding the time services provided by NIST via WWV.

NIST Time and Frequency Publication Database.

Addendum: Jim Miller, AC3BV gave this link on deconstructing a Sony WWVB clock. It included an external antenna/receiver combo, which output a 1hz pulse position modulated signal. Very interesting!