the above post was posted before yours, but yes you do see what I'd be up against if I wanted to do WP --> blogger.com
Its not a 100% WP--> Blogger.com post. For a normal blogger.com subscriber you don't get for instance ability to have blog titles, nor categories (last time I checked) so there are obvious limits. What I had in mind was,
WP field: title plus WP field post --> merged together -- > blogger.com field for the post
WP field: date/time --> blog field for date/time
Thats it. No other WP fields get posted over on blogger.com. All the really standard WP features such as commenting, etc stay on WP and are not reflected in the blogger.com generated post.
Issues: How to synchronize, automatically ensure edits on WP --> updated as well on blogger.com?
We'll get to that someday, right now let's focus on WP --> blogger.com, one-way, and anything else I can live with manual edits.