I recently came upon performancing.com. It is a professional blog for professional bloggers with an emphasis on commercial blogging. There are several different bloggers with lots of useful information for other bloggers who are wanting to become more professional bloggers. They blog on topics like search engine optimization, blog design, internet marketing, and advertising. There is also an emphasis on niche blogging and blog marketing which is very helpful to those bloggers out there. I think this is a great resource for those that work at home since many professional bloggers own home businesses.