I'm now using Shimano PD-M324. Can't say enough good things about this 2-sided pedal. One side is the run-of-the-mill platform pedal with a nice wide deck--great for any old shoe you want to wear with it. The other side is SPD. I tour with a pair of Sidi Genius 4 road shoes and a pair of Merrell Barefoot running shoes. On the highway between towns, I'm clipped in with the Sidis. When I get close to urbia, I slip into the Merrells and ride the platform side. Works like a charm. The best of both worlds with only one pair of pedals. The M324s are tough, fully adjustable, and serviceable (though I haven't had to service them yet, but I believe the bearings are replaceable).
Another good-looking pair of 2-sided Shimano pedals are the PD-A530s. I've read a lot of good stuff about them.
One pair of pedals that can handle two kinds of shoes makes a lot of touring sense to me.