Currently Being ModeratedApr 26, 2012 2:24 PM (in response to viador)
You can go here. It doesn't do much though, insofar as getting it back. But it does afford you with identification information to give the police, if you registered the product.
I hope you enabled "Find My Mac" on that computer, because with any luck, Logging into your iCloud account could yield its location if the thief tries to use the computer. It ain't much, but it's a far stretch better than just "reporting it" to the police.