Does a Bulgarian Citizen still need a visa to travel to the USA ?

Bulgaria is not part of the Visa Waiver Program, so you will need a visa.

Yes.

Bulgaria is in the EU but not in the schengen zone yet,
so yes you will need a visa.
Bulgaria joined the EU, on january 1st of 2007 , it should by the end of this year enter the schengen zone, after more documentation and verification, qualification; .(the date to enter the schengen zone was set for end of oct.2007, after approval?...........................)
but as of yet? a
visa is required.until further notice