- Adds call functionality. Customers can call directly from browser without installing anything new
- Integrates with Skype and Google Talk. Other IMs are around the corner. Hosted in AppEngine and Amazon cloud for scalability and speed (currently is the fastest live-chat)
- Social Tabs - you can customize the widget to show Twitter, Facebook and other social communities.
Let me know if there is any feedback you can give to us.
Disclaimer: I was involved in their team and have lot of association with them. I can vouch for their scalability on AppEngine..