Bibliophage was kind enough to answer my question regarding the oldest available thread.
Now, in my neverending thirst for knowledge, I’m curious as to who was the first person to get theirself knocked off the board. I realize that discussing bannings is a subject best taken up in e-mail. However, I view this as more of a historical question and, thus, eligible for consideration here.
But if I’m wrong, I willingly submit to whatever punishment Tubadiva deems necessary. 
Hard to tell, but this is certainly a candidate worth asking about:
User #5 dunl
http://boards.straightdope.com/sdmb/member.php?action=getinfo&userid=5
If a post count is given, but there is no link to the last post, that usually means it was moved to the hidden Moderators fourm, that only they can read. A person with only one post, and it’s on the hidden forum, usually indicates banning. Note that the word Banned does not need to appear for a user to be banned, as it is a separate step not always bothered with.
I was very curious as too see the dawn of the SDMB. I’m glad to finally have my curiosity killed. But I’ve also always wondered one other thing…and this seems like a good place to ask it…who is the first registered member here at the SDMB?
Dunno who was number one - if you search, the link won’t appear. But the second was Lynn Bodoni. At least, she’s user #2 (to see a user’s user #, just hold the mouse over the “profile” button beneath one of their posts and look at the “userid” number at the end of the string).
3 is Dan Kaplan, who works for The Chicago Reader (62 posts)
dunl is actually user 4.
jkeene
Ed Zotti
jcrandall
SDStaffKen
SDStaffWildBabe
jimboy
I’ve been here a couple of years, and this is the first banning thread as far as I know:
That’s might not be the best conclusion to jump to with really early Members. Most likely, it’s an artifact of the changeover from UBB to vBulletin, where IIRC the post counts were kept “static”. Thus, given the date of this person’s registration, it is possible that some UBB to vBulletin weirdness occured instead.
[pardon the slight hijack, but flite risk, do I know you? Re: your sig.]
Also, Sleepy Gene, there have been times when old threads were erased… at least, I’m sure I remember being told that all threads that hadn’t been posted to in x months were going to be deleted… was I hallucinating again? But my point is that there are other reasons why a thread doesn’t exist anymore, and to assume that it’s because someone was banned is probably not accurate.
Buck The Diver: We prefer to limit speculation about banned posters. Why give them more attention?