One of the most powerful things a speaker can do is evoke emotion is his / her audience. If you want to be memorable, you have to make your audience FEEL something.
If you are selling a product, you need to help your audience feel the benefits of that product. If you are selling a service you need to tell a story that helps them understand the power of that service.
I have found a blog that takes me on a rollercoaster ride of emotions. It really demonstrates the awesome power of connecting with people on an emotional level.