@ anon87733- Wintergreen and Canby grow well in acidic shade, and both look really nice in the fall and winter. They are both good ground cover plants.
Blueberries will grow well in your soil, and they attract lots of birds too. You might also want to consider junipers, which will create a low brush cover. You might be able to plant certain types of roses too, which will add nice color to the hillside.
Finally, maybe a redvein or two. these shrubs can grow to about 30 feet, but they look really nice with their drooping flowers in the spring and scarlet colors in the fall.