I'm a die-hard clipless roadie, but when I built up a beater bike for all-around use -- including my short daily commute -- I experimented with a few options. My road shoes (keo) were just too ungainly off the bike, eg walking into work. I tried mtn bike shoes and pedals, but they still required a change and weren't as nice a ride as the keos I was used to.

I found strappy toe clips really hard to use, and kind of dangerous.

Eventually I settled on "power grip" straps, and I have to say I'm really happy with them. I can commute in casual work shoes, but they have a clever design that gives you a really snug fit.

My only complaint is that they would get annoying on a really long ride. But then, thats not what they're for. For ambling around town, and wearing civilian shoes, they get my vote.