Interesting new service from Salesforce called Chatter that allows you to make a social network for your business. It's like a portal on steroids but is much more social. Scott Holden, one of my buddies, was one of the guys who put this together.
I also found it interesting cause I pitched this to Ning two years ago. They were not big fans. Here's my presentation via Scribd (btw - how cool is Scribd, that I can embed this for the world to see?)