Ye' old general discussion board. Basically, for everything that isn't covered elsewhere. Come here to shoot the breeze, shoot your mouth off, or whatever suits your fancy. This forum is not for asking programming related questions.
In terms of CMS, I'd recommend Mambo - quite straightforward and very easy to use, customise, extend and maintain. (URL is, I believe: http://www.mamboserver.com )
Aside from the infrastructure side of things (it usually helps if your intranet is on your network so you can authenticate users) it's not much different to an internet site. As in all things you design with the end users in mind.