I have a house on a slab in the North East. I want to remove the carpet and treat the concrete floors to be a finish product. I am not looking for paint finish. I was thinking about acid stain and I heard someone had actually used shoe polish and buffed it to make it look like granite or stone. Any ideas or tips?

I think this is what you are looking for, but don't think they used shoe polish !

Colourcrete - Concrete Staining Specialists (http://www.colourcrete.com)

I found this on Google using 'staining concrete', along with a lot of other sites regarding treating concrete to make spectacular floors, You may find one that is local to you and more accessible for advice.

Here's a site that may interest you:
Tom Ralston Concrete (http://www.tomralstonconcrete.com/Magazine-Articles/2007/Concrete-Decor-June-2007/page6.html)
Acid staining is probably the easiest since you don't have to acid etch the concrete first.