I would defintiely always respond when my children cry...it's just the nature of the response that some of the moms here are questioning.
I think it probably isnt' that comforting for a child to be told 'you're OK' when they are crying, as that tells them that their feelings aren't valid/accurate/whatever. And I certainly wouldn't tell a child to stop crying when they are upset/have hurt themselves/etc.
Instead, I think people here are suggesting that you accept your child's feelings...name the feelings for them and tell them you are sorry they are hurt/upset/etc. And comfort, but do it without undermining the feelings the child is experiencing, you know?
With a 10 month old, I'd keep it simple. If she'd fallen and hurt herself and was crying, I would probably hold her and comfort her, telling her something along the lines of, 'You fell down and that hurts. Mommy is sorry that you hurt yourself'.
Of course, you can still try distraction if it's just a tiny bump and a big fuss is going to create a big fuss.
But be ready to acknowledge and accept hurt/upset/etc. when it is there.
Hope that makes sense. (again - I'd really recommend the How To Talk book...even though your dd is very young, it has good ideas that you can defintiely start now to get yourself in the way of it...some of the ideas they suggest don't necessarily come naturally, to me anyway).