I'm putting together a Surly LHT to be used as an around town/errand/sometimes commuter bike.

My road bikes have all had standard Shimano road pedals, but for this bike I want something more flexible - to allow for walking around when I go to the farmer's market, grocery store, etc.

Ideally, I'd like to have pedals that can be clipped into (but, with "walkable" shoes), and offer a platform for when I don't want to be clipped in.

Jenson USA is offering a combo deal - $110 for SixSixOne "skate" style shoes, plus a pair of Crank Brothers "Acid" pedals.

Anyone have experience with these? Or, recommendations for alternatives?

A lot of people ride SPD-type pedals with mountain bike shoes; the cleats recess below the treads so you can walk.

In a Decathlon store in Paris, I found inserts I could clip into my SPD pedals to turn one side of them into platforms. I bought them and rode the rest of my tour in Europe with them. I really like them!! They allow me to wear regular shoes if I want, or my cycling shoes ... and what I especially found nice was that in heavy traffic in cities like Paris, London, and Strasbourg, I could ride with my left foot clipped in, and my right foot on the platform ready to drop at any moment if someone stepped out in front of me, or a car suddenly turned in front of me or whatever.

Oh, I should add, when I ride, I always use mtn bike shoes that look a bit like hiking shoes. They make walking so much easier. Mine are Lakes.
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I've got Shimano 324 (or similar) on my beater bike. They're perfect. I can use whatever shoes I happen to have on for quick trips to the QuickTrip or I can grab some real cycling shoes if I decide to take it on a longer ride.

i've been using the nashbar dual use pedals for almost a year now. no problems whatsoever. $19.99 + shipping.

on my roadie i use spd style pedals with mtb shoes. there are a few shoes out there classified as road-style with recessed cleats.

Performance has a campus pedal that works like a charm, platform one side, spd on the other. I have them on my cross bike and have never had a problem when I was clipped in or when I used the platform side. They worked great during my triathlon last month. Hope this helps.

You can't go wrong with the Shimano pedals that are mountain/touring SPD on one side and "platform" on the other. Not too expensive, but very high quality, and they seem to address exactly what you say you want. I've actually used these. I prefer my double-sided SPD pedals for most of my riding (they are quicker and more convenient to get into from stops), but the other ones go on the bike at certain times when I feel I want to ride in whatever shoes I happen to be wearing.