Debug terminal atmega128

I am new to the avr development environment. More used
to the basic
stamp. In the stamp we can open a debug terminal in
run time after
programming the stamp and have the stamp send back
serial messages to
the PC for display.

U can send a printf of some kind ,during runtime, from
the ATMEGA128
to the PC that is programming it.?

How do u do this?

I am going to use a parallel port programmer(AVRPG2
from olimex) that
is basically STK200 compatible. Can i send back serial
signals from
the MCU to the PC via this and read them to the
monitor of the PC?

I am using AVRGCC and Linux. What software should i
use. Any articles
available on this?

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