Jesus – A Public Speaker?

I just gave a speech in my Public Speaking class on Weblogs and Twitter. Although it went well, it did not go so well at the same time.
Only going 7 min on a 10 min speech, not a good thing. Oh well! This experience makes me wonder about Jesus and his “sermons”. Did he write them down? Did he think about it in advance? Or did he know the people well enough and was close enough to his father that he just flowed with the spirit? Did he just let God work through him?
Don’t get me wrong, I prepare for days and really seek what I’m supposed to talk about, but giving that speech just made me wonder, how good was Jesus at public speaking?