I cannot hope to recall even a quarter of the forums I got members from, but I am certain that the forums were diverse (ranging from Japanese cartoons to politics and even Neopets), and that rarely has a member come from a promotion forum. Indeed, I would not be surprised if most of them have never owned a forum, and have never heard of a promotion forum. Also, the one active member of my forum I know came from a promotion forum was unfortunately a troll, and one of only two members since my forum's founding in June, 2004, to be banned.
In addition, it was not until 2007 that promotion forums caught my notice and I registered to a few. However, I never "utilized" them, and for the most part would only submit an advertisement topic, if even that. To this day, I prefer to use promotion forums in the way I recently described to Tonyblack, a member of phpBB Communities:
I visit promotion forums in order to look for a decent community or to help people out, not to gain "services" or otherwise help my forum.
I also see promotion forums as a resource and form of entertainment, as I like to read the forum reviews, and the forum management topics.
Going back to the forums I got members from, I may not recall most of them, but there are a few notables to mention, all of which I was a member at for years and amassed some of my highest post counts at (nearly 1000, which is more than usual for me).
First, there was the now non-existent Project-Ion, a role-play forum, which is where I got my first few dozen members from. These members include all but one of my current staff (yes, they stayed around since 2004), and they were crucial to building up a lot of content before I devoted much time to advertising.
There was also PinkPT, the next forum I got a surge of members from. Lastly, StarDestroyer.net, another forum I was active at, gave me few members, but that forum is worth mention here because the members from there were among the most contributive I ever received.