What is the difference between VISTA HOME BUSINESS and PREMIUM?

As the thread title specifies what is the difference between VISTA HOME BUSINESS and PREMIUM?

Is it that WINDOWS VISTA does not have better hyperthreading than Windows XP?

Thank you in advance.

It seems to me that the Home Premium has the "working group" can not integrate it into an area such as Business same as XP Home <-> XP Pro.

The absence of the Media Center in Vista Home Business. While Vista Home Premium lacks protection against hardware failure and some networking features.

Comparison of various Windows Vista Editions.

Hope this will help you.