White Paper: Collaboration Software Clients
Ok, this is a bit more technical than I usually care to write about. But Shared Spaces' white paper on "Collaboration Software Clients: Email, IM, Presence, RSS & Collaborative Workspaces Should Be Integrated for Business Communication" is a good comparison between those collaboration tools. Could be useful to, for example, your internal discussion on how to use blogs and wikis in relation to existing tools.