We all know the holidays can be overwhelming. But have you ever considered how stressful they might be for the Living Impaired? These Zombie-inclusive times call for a whole new guide to managing the season. This concise little book for the Undead intersperses tips like ''Keep your head, '' ''Dress to kill, '' and ''Shop 'til they drop'' with illustrations that are, well, dead-on. Coping strategies will help anxious Zombies conquer even Secret Santa shopping and discover that the true spirit of the season is indeed, er, infectious. Having written books for Peter Pauper Press on everything from beer and blarney to etiquette and entertaining, prolific author Ruth Cullen devours most any topiceven Zombies. Undead Illustrator Lisa Fargo, of Fargo Design, Inc., is based in Pittsburgh.