For cc, modding and development, I think a single spot will be better.
Can you explain why? Kaldor offered a very good reason why not -- that being the history of NWN-related sites. Massive losses of useful knowledge at the original Bioware forum, then the IGN Vault (all comments except 1 page), then this forum. The original Bioware forum can't even be accessed through the Wayback Machine anymore, due to some kind of redirect Bioware has in place, unless there's some trick I don't know of. I could offer a few more, if I weren't trying my best to remain positive.
For modding and development, I would like a forum where I can quote people like this, and where I can post code without losing its formatting, and preferably with colour coding (these things are present on the Nexus).
Anyway, I am also good on using both vault and nexus. I guess it's up to us to make nexus an alive forum. Is there a way to request some more subforums? CC and module specific come to mind.
There's a subforum for making requests for the site, or they can be PMed to Dark0ne. There are already 3 module-specific subforums for each game, though -- Mod Talk (general), Mod Troubleshooting, and Mod Requests.
The Nexus has been there for me through five eras of my modding life, where I focused heavily on specific games for long periods of time, and released major mods for them. Oblivion, Fallout 3, Morrowind, Dragon Age: Origins, and finally Neverwinter Nights 2. I joined in 2008 during my Oblivion period, but it was around for much longer before then. I have never felt like a second class citizen there for which game I prefer, unlike certain other sites. It has been a rock of stability, a beacon of welcome for modders, and my home.