The early Pam Grier stuff (sexploitation pics)- 'The Big Bird Cage', 'The Big Doll House', 'The Arena' and 'Women in Cages' and the later Pam Grier (blaxploitation pics) - 'Black Mama, White Mama', 'Foxy Brown', Sheba, Baby' and 'Coffy' and not forgetting 'Scream Blacula, Scream!'
If you're just getting into Pam then I'd recommend either 'Coffy', or 'Foxy Brown'. Whilst they both have that mix of 'sex' and 'soul' they're also pretty damn good classic movies.