These are written for sociologists but pretty much all carry over to economics.
I would highlight the following:
1. Practice your talk a lot.
2. Don't BS when answering questions. If you don't know, say so, and write it down. Following up later by email in such cases is a good idea as well. You lose fewer points (if any) for not knowing than you do if you get caught fibbing.
3. Be interested and enthusiastic about your work. I am always amazed at how many people act bored with their own work or do not seem to take responsibility for it, as if they are presenting something written by others in a class. It is your work; if you don't think it is cool, no one else is going to. And if you don't think it is cool, you should not be on the job market.
Who was my favorite student this term?
10 months ago