Rarely do you come across anything as informative as this site. Anita Revel's research provides the witch with great detail and the origin of the Goddess within each culture, such as:
Inanna is the Sumerian goddess, honoured at the dark moon, as it is she who fixes destinies at each new moon. Inanna's journey into the underworld and subsequent revitalisation represents the soul's evolution through hardship into glorious renewal.
In her quest for clarity and knowledge, Inanna Queen of Heaven and Earth descended to Earth to rule her people, where (so that her people would not know hunger) she made a sacred marriage to ensure the fertility of the lands. She thirsted to understand first-hand though, the true sufferings of her followers, so she descended again, this time to the realm of the underworld, the domain of her sister Ereshkigal....
The majority of the website hosts a list of Goddesses on the right hand side - a great deal I'd never heard of - which she has gone into great detail on from Egyptian, Welsh, Sumerian and many other cultures.