I'm a big fan of the Shimano M324 pedal and have them on five of my bikes. I can clip in when I want to - which is most of the time - or jump on and ride, regardless of whether or not I'm wearing cycling specific shoes. I used to like Speedplay pedals. They worked well on my "speed" bikes, but frankly my riding is a lot more leisurely than it once was and I like being able to get off the bike and walk around.