If you are serious about blogging, or want to be, this web site is a must visit and rss. It is best described by Nick Wilson at performancing.com:

About Performancing
Nick Wilson’s picture
Submitted by Nick Wilson on Mon, 2005-11-07 16:37. ::

Performancing.com is a group weblog written by professional bloggers, for professional bloggers. The emphasis at Performancing is commercial blogging.
The Performancing.com Mission

“To create a home for professional bloggers. A place where those that want to make money from their blogs can learn, and perfect the art of making a living from weblogging.”
Performancing LLC