What are some good haircuts for long straight hair that won't make it shorter?

Your looking for more of a different hair style rather then a different hair cut. Most beauty salons will have hair style magazines for you to choose from. Bangs will not make the length of your hair any different, nor will layers.

Maybe you could try cornrow, partings on different sides ponytails and curls/ straightening your hair. A good start would be to find inspiration in a hair magazine.