There's a book about the Irish sent to the Caribbean: MacInerny, Rev. M. H. (1909). Irish Slaves in the West Indies. Dublin: Sealy, Bryers & Walker.

Here's an interesting family-genealogy page with some stuff:

http://www.kavanaghfamily.com/articles/2003/20030618jfc.htm

Of course, Irish people in earlier times had made lots of money from slavery; I understand that they used to trade Scandinavian slaves down to Rome at one stage, the main slave market being around where Mulligans is in Dublin now.