I am running the newest versions of Joomla and Netcdlassifieds Premium. The creators of Netclassifieds were going to create a bridge for me so both systems would share the same user database. Both systems would also need to share cookies so that users wouldnt have to log in/out when going from one portion of the site to another.
The developers were going to charge me $50.00 but this was a while back and I think the entire NC project is moving pretty slow right now. If anyone can match their price for this job that would be great as I have been waiting a while now and would really like to get this done soon.
The NC developer was going to use a bridge in order to do this instead of heavily modifying either system. This way either system can be upgraded individually (unless major DB changes are made) and there is little chance of either system breaking due to the modifications. I would like to still go this route.
NC does handle more information upon registration then Joomla does so that will be an issue to be worked out. They were going to enter only the basic info from registration and then upon visit to using the classifieds section for the first time would be required to complete their registration there.