AVR-Chat

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?