We are currently evaluating Graffiti CMS, another product from the excellent developer-focused firm, Telligent*.
We use Community Server here at AbsoluteVista.com. However since we do not avail ourselves of the other powerful features of CS, moving to Graffiti for blogging alone will be 'a god thing'.
Props to Telligent for another hit!
*Telligent's main product is Community Server, which has powered AbsoluteVista.com for the past year. Telligent is also one company I wish Microsoft would purchase, since the ease of use of their products, and the fact that the products provide solutions for Microsoft technologies would, IMO, make it a good fit. Furthermore, they take tech support to the max, even for their free products.