Amber Madison — the woman Peter Florrick slept with, the scandal from which the series began — is a minor character in "The Good Wife", but her pending “tell-all” makes up a significant plot point early in the series.

She even teases it with Chelsea Handler, forcing Alicia to once again withstand a public humiliation.

http://ew.com/books/40-fictional-books-movies-tv/amber-madisons-tell-all-the-good-wife