The Complete Book of Running for Women by Claire Kowalchik
Absolute Beginner's Guide to Half-Marathon Training by Heather Hedrick
I found both of them to be informative and each offered several training schedules. I haven't decided which one to follow just yet nor have I selected my first race to train for. I think there will be a 5K here in town at the end of April during the Twilight Criterium.