I was lucky enough to attend a class with Kaye England here in Australia way back in 2003. What an absolute hoot of a tutor she is, haven't laughed so much.
On the Saturday the class was a Sampler quilt using different sized blocks and on the Sunday the class was called African Experience. It was "shocking" at first to not iron as you pieced but it didn't take long for the concept to sink in. I must admit I rarely use the iron now as I piece my tops, but I do make sure the fabric is pressed and starched before I start.