My colleage Brendan and I frequently talk about flipping our classrooms--assigning initial instruction as homework, in the form of videos of us (or other teachers) delivering the content. This would free up class time to answer questions or work on more intensive projects. We look for Kahn Academy videos and other methods of providing content. Right now it's just talk, but I think we are (independently of one another) going to spend some time this summer trying to make it happen.
Peter Pappas outlines how he started flipping his classroom, and how we might start even before the year is out.
As a bonus Peter Pappas blog entry, he answers the question, "What would schools look like if students designed the school?