I just upgraded to Adobe CS3 and have a couple of questions.

What is the Healing and History brushes for?

What is the sponge,burn and dodge tool used for?

Thanks!

Healing

It uses the same sampling principal as the Clone tool but works by blending the original and cloned pixels together to create a near-perfect fix.

History brush

Every time you perform an action, such as painting a stroke, applying a filter, or deleting a layer, that step is stored in the History palette as a
‘state’. By clicking on any of these, you can return your document to the
state it was in at that point. Now, here’s the best bit – by clicking on
the small icon box next to a history state in the History palette, you
earmark that layer as the source for the History Brush. When you then
paint on the image with the History Brush only those pixels will be
returned back to the earmarked state.

Does this helps you ?

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Yes it does help,thanks. I like the ideal of the history brush.