magirl - I am with you as I will be 31 by the time my wedding rolls around and I don't feel the need to be "given away" either. However, I do think pictures of my father and I walking down the aisle will be special for my dad and my mom. So my plan is to walk down the aisle with my dad, but to not have anything in the ceremony like "who gives this woman to be married?"
For reference to my personality: My now brother-in-law asked my father for my sister's hand in marriage before proposing. When my Dad told me, I responded with: If a man ever asks you for my hand, you had best turn him away and tell him that he needs to rethink how well he knows me.