It seems that when I put together the blogger and metaweblog api support for the post tool (2 years ago, I think), I didn't really read the specs (such as they are) correctly. Mind, you, these api's are a rats nest of oddness - semi-standard entry points like getUserBlogs, for instance, seems to be required by various tools, but is only anecdotally documented. In any case, I'm in the process of going through the weeds of these apis. I should have something semi-reasonable later today