Seriously. Who the hell wants to pay for SharePoint when you get this for free? With about 40 seconds configuration time to boot?

Google Sites (based on JotSpot) ups the ante considerably on Google Apps Team Edition. Arbitrary file uploads of up to 10MB with a minimum 10GB cap will provide a huge, huge boost to its popularity.

Now, if Google could just provide OpenID support instead of emails for login, I would have a close to perfect federated collaboration system :)