I have downloaded and installed Skype 4.0. That is a completely brand new interface. A ton of improvements are added. In the keypad page, a SMS button is added. So you can type in the number to send sms. In the older version, only those in your contact list can be sent SMS. Moreover, if you click your contact, the call history of that contact will be loaded. That is like a CRM. I love that!

For sound quality, that is a great improvement too!

To Download at http://www.skype.com