Some clitorises may seem smaller, but think of them as just the tip of the enjoyment iceberg. The whole clitoris and surrounding areas are packed with nerve endings and very sensitive. The clitoris is the same tissue—roundabout—as the penis—it is just distributed differently. It can feel really nice to touch and can grow when aroused (kind of like an erection). How much is grows and changes depends on your body. There is a lot of variation with this.
For more expert tips and info on clitorises and vaginas, check out Bisk.co.uk’s page on vagina/clitoris areas.