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Here's a copy-paste of my getFaceNormals procedure, which I wrote for my auto map script. It takes in a string variable containing the name of the polygon object and returns a vector array containing face normals.

Code:

// getFaceNormals by kbrown
//
proc vector[] getFaceNormals(string $sPolyObject)
{
	vector $vNormals[];
	int $i;

	// get all face normals in to a string array
	string $sFaceNormals[] = `polyInfo -fn $sPolyObject`;
	
	// parse the string array and create a vector array holding the normal info
	for($i = 0; $i < size($sFaceNormals); $i++)
	{
		string $sBuffer[];
		tokenize($sFaceNormals[$i], $sBuffer);
		float $fX = $sBuffer[2];
		float $fY = $sBuffer[3];
		float $fZ = $sBuffer[4];
		$vNormals[$i] = <<$fX, $fY, $fZ>>;
	}
	
	// free some memory
	clear($sFaceNormals);
	
	// return the vector array
	return $vNormals;
}