Had SPDs for a while, but now run Time ATAC MTB pedals and cleats. They give me more float and lateral movement (side-to-side). I am a daily commuter and for commuting I use a pair of Keen all leather (heavy), but keep my feet dry. They are not as stiff as my Specialized carbon shoes. If I am out on a fun (non-commute) ride, I use the carbon soled shoes, because the spread the pressure out beyond the cleat point.

In the past, my road bike had the Shimano pedal, similar to Look cleat and expensive Sidi road shoes - pressure distribution and all. Tough to walk around though and cleats would get totally chewed up. I've used my Time pedals and Specialized shoes on the roadie recently and they work fairly well.