To me, Sarah Silverman has always been a bit underwhelming. She can make me chuckle from time to time, but her comedy is pretty one dimensional. My favorite woman comedian is Maria Bamford. In a lot of her bits she does voices of other people, her mom, co-workers, etc, and they crack me up. Her routines are best taken in as a whole, but these bits will give you a taste:
[yt=425,350]T_zzOtrK0io[/yt]
[yt=425,350]wtLY6pa2zcY[/yt]