We've sent out the first 1500 invites to old users. Post here and say hi and tell us what you've been doing!
I've been here. In other news, only 1500? I assume that's the only users that were active towards the end?
Follow the instructions on the Site Support forum thread for accessing old accounts. Email the sysadmin account if all else fails and I'll sort you out.
I don't even remember my old username anymore for Nexopia, but I still talk to tons of people I met from the old site.
Is this one the oldest you've found? Even if it is, that's pretty epic, sub-300,000 UID. What's the account? Many of the pictures got migrated.