What actions can I take if someone stole my credit/debit card number?

Question Details:

It was used for over $500 in 2 separate transactions ($570.11 to be exact); 1 transaction has already gone through. It was a point of sale transaction. My bank is working to reverse it. The other was an on-line purchase that I caught while it was still in pre-authorization, so that company is working with me to stop it. The person didn't even have to use my name for the on-line transaction. Just the card number. When I called to inquire about the purchase, they couldn't find any orders under my name or address, so hopefully tomorrow I will know the persons name/alias and/or shipping address. I have never shopped or made purchases with either of the businesses before.

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