There used to be a thread at talkstox.com which was over 100 pages long. It required a hack to group the page numbers since they were screwing up the layout. 1000 posts isn't that big i'm afraid.
On the RageAgainst the Machine board there was a thread with over 3700 replies until the moderator closed it. I think it got pruned eventually but long threads are pretty typical there.
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