Thanks everyone - definitely some things to give a try!

I think my seat is at the right height, though it's not exactly a woman friendly seat. It is thin, which is why I'm inclinded to think it helps prevent some numbness... fewer contact points. Though its something to take a critical look at.

My shoes seem ok - they are actually moutain shoes with laces. If anything, sometimes I wonder if I don't have them tight enough?! Their biggest problem is that they aren't very stiff - makes them easy to walk in though. I think I'll start some extra toe wiggling and see what that does.

CorsairMac - If it was just one foot I would guess medical issues like you describe would be a possibility. My left ankle was *destroyed* in a soccer incident (Dr's didn't think I'd be walking again - proved them wrong ), and I have much resdiual numbness from that. But this is happening in both feet.

Anyway, I'm hoping the certified bike-fit people will be at the shop on Sunday so that I can pick their brains!