I searched the archives for awhile, and I found the earliest post i could find, and it was on my old nickname U-421.. The nickname i used for the WPL also.
http://www.subsim.com/phpBB_archive1...ic.php?t=19671
Obviously based on how i was talking, it seems like it goes further back. I was a member of WPL clear back around July 2001, a bit before SH2 was initially released.