For alls the features look at http://plone.org/ , I just put here the ones we should use. Since Plone is a Content Management System I do not list the features of such a thing.

• Member Base
• Free Join (sending passwd over email for Identification)
• Member Folders for Private, Visible and Published Stuff
• Different Roles for users
• Delegation in Homefolders possible
• Workflow
• Private / Visible / Pending / Published States
• Everyone can add News, Events all kind of Documents and make Them visible (for referencing in mails etc)
• Content Types
  • Documents (Structured Text, HTML, plain Text)
  • Images and Photos (automatic thumbnail, small, ... generation) Photoalbums
  • Audio Content (wav, mp3, etc...)
  • PD Patches with own mime-type and rendering (planned)
  • General Files
  • Wikis: CMFWiki? or ZWiki?
  • Forum ??? (dont know if this is good, since Wiki is a forum tool to)
  • Collector eg Bug-Collectors, Idea/Feature Collectors
  • News (everyone can write and some can review and publish) (maybe this could be a blog?)
  • Events (news for Calendar, everyone can write -> publish)
  • ... please add wishes
• General Features:
  • Search Engine over the whole Site (also into PDFs?, etc)
  • RSS Syndication

  (whatever this is ??? fbar: This is cool. It allows us to publish headlines, that other sites like http://devdsp.net can include in their sidebars)

• bookmarkable
• We could make some Products like Library, etc, Everyone can create and they could be search like in a database
• External Database (for unique external object names ;-)