I love a minimal shoe during the day, and wearing the Nike Free 3.0 almost exclusively for the last couple of years has made my feet stronger. Standing in a minimal shoe improves your proprioception, and should improve foot intrinsics. So if you're running in them, I'd wear a pair during the day, but work into that. Start with an hour or two for a few days, then 3 to 4 four hours for a week, etc., until you get up to a full day in the shoes.