Nokia have given their developer portal a facelift and name change today to become Nokia Developer, and forum.nokia.com now redirects to www.developer.nokia.com.
As far as I can tell, the content and menu’s are mostly the same as before, just changed in colors, fonts and styles, plus branding. Nokia say this is a part of a wider effort across Nokia to have a consistent presentation style, and they say they have also made it easier to find things, and have added a new Developer Library. I haven’t had time to explore too much, but it certainly a lot cleaner.
http://www.developer.nokia.com/New_Nokia_Developer.xhtml has the full story.