Why don't I start by taking a look at Planned Parenthood itself? Their website is wonderfully put together and quite informative.

Founded in 1923 byMargaret Sanger as the American Birth Control League, PP has had an interesting and tumultuous history. Pretty much everyone knows that abortion was ilegal until 30 years ago and the Roe v. Wade decision, but did you realize that contraception itself was illegal at the beginning of the century/ A chilling thought, indeed.

Planned Parenthood's mission and policy statements are something I can really get behind:

Planned Parenthood believes in the fundamental right of each individual, throughout the world, to manage his or her fertility, regardless of the individual's income, marital status, race, ethnicity, sexual orientation, age, national origin, or residence. We believe that respect and value for diversity in all aspects of our organization are essential to our well-being. We believe that reproductive self-determination must be voluntary and preserve the individual's right to privacy. We further believe that such self-determination will contribute to an enhancement of the quality of life, strong family relationships, and population stability.

More in a bit...