Lightroom 4 beta really rocks! I love the new localised colour temperature adjustments and other new features. As an underwater photographer, though, I wish there was greater range on the temperature & tint adjustment sliders. Due to the way that colours change as you go underwater, the white balance shifts that underwater photographers have to deal with when working with ambient light is far greater. Aperture handles extreme white balance shifts much better at the moment - would love to see this situation change!