If you know of any other blog management tools which allows for selective posting and crossposting to multiple blogs, please do let me know.
I’m using/testing Microsoft Live Writer. No ms live spaces login/account is needed to use it. It can be configured to work with any existing blog. It is a desktop app which is easy to install and easy to configure. After setting up the first blog, under the Weblog menu>Add Weblog account.
There’s no need to go to the website to post, either.
To post the same article to multiple blogs: Create your post, click Publish (Control+Shift+P). After publishing to blog #1, under Weblog menu>choose other blog to publish to (this will connect you to that blog account). create post. click Publish. Continue until you have published to whatever blogs you need to post to.
To post different posts to different blogs: Create your first post for one of your blogs; Click Publish. Then click New; Weblog menu>chose other blog to publish to; create post; Publish. Continue until you have published to whatever blogs you need to post to.