Here is an AVR "Hello World" demonstration that writes "Hello World" to your PC VIA serial to USB every 1 second (open hyper terminal to see).

/* 
Made by www.Nerdful.com
Prints HELLO WORLD to the PC VIA serial RS232 (terminal)
*/

#define F_CPU 14745600
#include <avr/io.h>
#include <avr/pgmspace.h>
#include "../libnerdkits/delay.h"
#include "../libnerdkits/uart.h"

int main() {
uart_init();
FILE uart_stream = FDEV_SETUP_STREAM(uart_putchar, uart_getchar, _FDEV_SETUP_RW);
stdin = stdout = &uart_stream;
while(1) {
printf_P(PSTR("HELLO WORLD from www.Nerdful.com\r\n"));
delay_ms(1000);
} 
return 0;
}

What pins does it output the serial data to?

It returns the test through the USB adapter to the computer.

ummm TEXT - not test...DUHH, Dyslexic fingers.

Hmm...doesn't seem to be working for me. Maybe I did something wrong?

Nevermind - the code works fine on the pins 2/3 with the included serial adapter...you just have to remember to set the baud rate to 115200 in PuTTY ;)