Mark & I didn't live together before we got married. I really didn't want to because I felt exactly as Bnormal said it so perfectly:

However, my stock answer would be, "no". Do not live together before getting married. I think that part of the "fun" of newlyweds would be the "discovery" process of really getting to know each other on a new level. Doesn't the honeymoon lose a bit of its' luster if you pretty much know each other so well?
If I had it to do all over again, I would do it exactly the same.