Speakageline enables you to publish a voice or video message from your phone to your blog.
Just ring the number and a media byte is published, there is also a conference feature so an interview can be posted just after it ends.
Or you can use it for your blog visitors to call a number to leave voice or video messages, see others like Jaxter, Jangl, and MobaTalk.
You could basically make a podcast blog where all your posts are published remotely. Services like Pheeder, Evoca, MySay, Yodio enable to post media on the go, but they are more social network generic type blogs (most have widgets), but Speakageline posts directly to your blog as a new entry.
Perhaps Jott is the closest service so far that enables remote publishing of media as a new blog entry.
LetMeParty allows you to SMS a post to your blog and Spinvox enables you to ring a number and leave a voice message which converts into text as a new blog entry…plus visitors can ring the number and leave a message that converts to text.