Platanos and Collard Greens is a play based on David Lamb's first novel, Do Platanos Go Wit' Collard Greens which centers around a romantic relationship between an African-American man and a Dominican woman. I have not yet seen the play, but I have read the novel. One recurring theme is the common African heritage of African-Americans, Dominicans and Puerto Ricans.
To be sure, there are other works on this topic I would recommend more highly such as Piri Thomas' Down These Mean Streets or Jesus Colon's A Puerto Rican in New York and other Sketches. But Lamb's novel, and presumably the play, serve as a decent introduction to these issues in the idiom of the hip-hop generation.
On cross-racial unity:
an open letter from latinos to african american sisters and brothers
on being black at a latino march
On Afrolatinos and the African component of Latin culture:
piri thomas interview
the afrolatino connection
black and hispanic
the black latino experience
somos primos: black latino connection
african aspects of the puerto rican personality
And for a heads-up on an upcoming conference at UC Berkeley:
beyond visibility: rethinking the african diaspora in latin america