The best tip I have to improve all your meetings is to write everything up; to write everything that anyone says so everyone can see it. Our short-term memory is not very good, and we want people to focus on finding patterns, ideas, and solutions. Not to try to remember what everyone said. You can do this directly on a whiteboard, on post-its, or you can just launch your projector and start writing in your favorite word processor.
The important thing is that people can see what is said.