The old Forum membership list is definitely dead. There may be some way of retrieving the old posts or topics, but I doubt it more and more, and I have to admit to feeling a sort of relief, like a clean, fresh start. I'll probably keep investigating ways of importing some of the old content, but it's probably a dead end.
Everyone should feel free to re-start their favorite topics, as I've done in a few cases. I do have a list of topics from the old Forum, about 1,600 of them, and I'll probably cull out the obviously irrelevant or redundant ones, and post a list of some of the rest that people can go through and say "Oh yeah, let' talk about that again" or else "Hmmm, better to let that one be forgotten."