My first was a girl, which is what DH and I wanted. We both felt like we would be more comfortable parenting a girl - myself especially, since as a tomboy I felt like my mom had really mis-parented me in some ways, trying to make me more girly, and I was determined not to do so with my daughter (haha, she turned out to be pure girly-girl, go figure).
Our second was a boy - the guy who did our ultrasound told us like it was the most wonderful thing in the world but DH and I were both bummed. Neither of us knew what to 'do' with a boy, we couldn't even picture ourselves parenting one. We struggled with it on and off all the way through the pregnancy. You know what? When he was born, he was the most "right" thing in the world. It dissappeared in an instant.
Now having one of each, I am so happy about both of them that I really can't decide which I'd rather have next! I'm sure whatever this baby is, it will be the perfect baby for us.