What do you look for in a self-defense class?
One woman shares the results of her search here. She found slim pickins--most of her web search turned up fight-driven, dominance contest "training" or sites that aim to "educate" the reader by scaring them witless. It's hard to find a good class, but she did find Wenlido, a group teaching self-defense in British Columbia since 1976. I don't have any personal experience with them, but they have a great reputation.
Guidelines for selecting a good self-defense class were drawn up by the National Coalition Against Sexual Assault and can be found here.