See roundup of January specials in the Mercury News by Linda Zavoral:
Napa Valley, Jan. 22-29: The deals here offer a chance to try the cuisine at some top-tier restaurants. Menus: www.visitnapavalley.com.
Sonoma Valley, all month: Not to be outdone by its neighbor, Sonoma is offering dining promotions the whole month. Menus: www.sonomavalley.com/delicious/.