What countries in Eastern Europe let citizens come to the US without a Visa?

I have heard that Slovakia and a couple of other eastern
european countries are able to have their citizens
come to the US without a Visa,

check the American home land security site I think there is 27 countries that don't need visa with special new passports.

Slovakia is not on the list at this time; Slovenia is. You can find the complete list and any other specific information about visa for the US on the Department of State website. http://travel.state.gov/visa/temp/without/without_1990.html#countries and http://travel.state.gov/visa/visa_1750.html