I'm a junkie for the Shimano, dual SPD pedals where one side is clip in and the other is platform. I have both the T8000 for my trekking bike and PD-EH500 for my road bikes and recommend them highly. They're well built and light for what they are. Obviously, nobody's racing with these pedals. I'm clipped in 95% of the time but it's nice to have the option for:

1) A shoe or clip failure that would make the platform side useful.
2) Running to the store.
3) Riding in heavy traffic.
4) A casual ride with the family in my Crocs.