Ideas for Landscaping a Steep Hill?

My suggestion for you is this: get plants with very low maintenance, perhaps rosemary and daylilies; daylillies will thrive anywhere; and if you get the stella d'oro's they will bloom repeatedly. However, many of the other daylilies are a lot taller, and they still make an awesome display of beauty. I personally like the foliage of them also!

You might also go and check in your area for how the steep sides of the highways or the freeways are landscaped. This might give you some great ideas as well!
Another idea is to call your local county extension office, which is manned by master gardeners; they might have excellent ideas, and being familiar with your local area, would have great ideas re which plants would work best in your area.
Do you want to landscape the entire hill the same way? How about terracing and then planting in the terraces? Or doing various sections of the steep hill in smaller individual "gardens"? where you can enjoy each one on a bench etc?
(I have a secret garden that I love!)