There is this same thread in General, but I thought it would be fun here, too! I did a search of my name and clicked "ascending order" to find my very first. I posted twice in other threads with a comment on the day I joined which was 8/30/03 - but this is my first REAL post. It was from September 2003
Introduction

How about finding YOUR very first post and putting it here??

PS: Marty is the pen name I always used on the Internet back then