Not that you needed to be told but: read Bossypants. Did you have something else to do? End it. Don't start it. When, in the introduction, it's promised that "each component of this book was selected to provide you with maximum book performance," believe it. I read this in a day, on the way to work, back from work, with dinner, in bed. If I was any happier with it afterward, I would have thrown it across the room.
Highlights include a chapter about her father, how the rules of improvisation can improve your life, experiences with and perspectives on institutionalized sexism, how to be a manager. There is a chapter where she goes through the writing team for 30 Rock and highlights each member, along with a sample joke of theirs. This is especially rewarding for those who can quote episodes verbatim; knowing a former carny who watched a man die is responsible for having made Alec Baldwin say, "Never go with a hippie to a second location," multiplies the funny. Just go give Tina Fey $26.99: she gave you a meme, people.
Also, Kotex Classic! May I never forget again.