I just wanted to post a small note of caution here. As long as your not in a recliner with bunny slippers, I see nothing wrong with reading your sermon. My Pastor actually did this at my new church and it was great. When you have like 45 minute sermons, and you've been doing hours and hours of studying, it's great when I get to hear everything he studied in that time, in a organized manner. I just want to give a slight warning. It's not as much the method but the message. I say pick the best method according to your strengths God has given you, and according to the needs of the congregation. Whether that's a manuscript, an outline, or you just reading off the full sermon.