Anyone who wants to populate multiple weblogs from Radio can do that with the Manila-Blogger-Bridge. But it can only handle Blogger-API and only one category, namely the homepage. However, if you'd like to selectively post one article here and the next one there, you should take a look at Footbridge. Very interesting tool, you can specify for individual categories whether they should be copied to Livejournal, Advogato, or to a Blogger-API system. Separately for each individual category. Very practical.