Fred,
at the risk of seeming disloyal to Jon and his products (!), I can tell you that there is a tool available at Incansoft, which will take a spun article and post it to your blogs.
You'd prepare the article in TheBestSpinner, then copy and paste it into the blog post application.
There's a bit of setting up to do in that application, as you can imagine (account details and so on), but once it's done, it's done.