This new blog on the use of Sharepoint for business (http://blog.sharepointforbusiness.com/) looks cool to me.
As the name suggests, it is about Sharepoint, so good news for the Sharepoint users. But it aims to focus on the use of Sharepoint for business. And this is certainly also valuable for any one with an interest in using collaborative technologies in business.
My suggestion : subscribe to the RSS feed, I already did.