In reply to Tyler: Although things like Trango Ss are boots they are so light (all synthetic), in your rucsac they aren't much more than a pair of approach shoes. But strap on some G12s and I can climb 75 degree ice in mine happily. I'd like to get some light crampons as well but the missus would get upset.
But lots of trainer/rock shoe combos that would take a full strap walkers crampon:
www.sportiva.com/products/prod/350
www.sportiva.com/products/prod/359