Veneration of ancestors (who are called eggun or egún) is an important part of the Orisha religion. Check out the various ways of celebrating ancestors and the ideas behind the practice.
Ancestor Reverence
Several articles detailing the practice and concepts behind ancestor veneration. Parts
I
II
III
IV
Eggun: The Dead
A description of the place our ancestors have in the religion, including descriptions of the bóveda altar and spiritual mass (misa).
Different Aspects Of Egun Veneration
Ways of honoring egun, including songs and prayers.
Espiritismo
Espiritismo (Spiritism/Spiritualism) is based on Allan Kardec's tradition and frequently syncretized with African and Indigenous ancestral and medium practices of talking with the dead.
The Iku
A poem about the iku (the dead).
Mojuba: Sacred Lukumí Invocation
A breakdown and explanation of Lukumí prayer.
Oriki Egun
A praise song for the ancestors.
Palo
Palo, a tradition from the Bantu, is often sought out for it's spiritual work with ancestors and spirits.
The Religions And The Life/Death Question
Those that has its religious roots in the Jewish-Christian thought find great difficulty to understanding the African or afro-descending religions when the subject is the ethical and moral values which regulate the relationships among the people and among those same people and the divinities that are praised.
Ancestor Veneration in related traditions
Ancestor veneration in other African Diaspora traditions
Ancestors in Dahomean Vodoun
Hisotrical origins of the Ewe and Fon.
Ancestors In Haitian Vodou
An excellent overview of the Haitian view of their dead.