Here is a really great dip/spread adapted from The Greek Vegetarian, by Diane Kochilas (p.31): Kopanisti. The name is Greek for whipped or beaten, and it consists of feta cheese that is whipped with olive oil, lemon juice, and freshly ground black pepper.
There are many variations on this theme which incorporate other ingredients such as red pepper, herbs, garlic. You might see feta cheese dip recipes under these names, as well: Tirosalata, Htipiti, Htipi Tirosalata. The recipe can also include some Greek yogurt.