Hi,
searched your pages for MetaBlog and Live Writer without success, so there apparently is no support for the MetaBlog API yet. I often use MS Live Writer to post to my private blog running graffiti. Apart from the ease of use working with Live Writer on the desktop, the MetaBlog API allows adding posts from nearly any mobile gadget with adequate editor. And as v4 is supposed to boost community building, "mobile content" interfaces should be supported by Kentico CMS.
Just my 2 ct.

Best regards,
Jim