Good approaches to integrate research and teaching?

There is an effort at my university to promote "research integrated teaching," which got me thinking about the topic. I generally make an effort to discuss research problems and recent results when they fit with the material we're covering in a course, but it occurs to me that this is a very passive approach.

I'm interested in developing more active or creative ways that research work and teaching efforts can be combined to benefit the quality of teaching without negatively impacting research. Are there any approaches that have shown to be particularly effective?