Either way is proper. My personal perference is at the top so you don't have to scroll down to read it. However, it is considered proper to strip out all the previous messages (replies) except the one you are directly replying to. Far too many people don't do this.
>Is is proper etiquette to include your comments at the top of a message you are replying to, or at the bottom?
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer