Well, one way you could automatically cross-post occasional selected posts is to use FeedWordPress together with WordPress’s category feeds. So, you could create a category named (say) “Crosspost: Acme Technologies Zeitgeist”, place all and only the posts that you want crossposted to ATZ under that category, and then have FeedWordPress syndicate the Atom or RSS feed for that category. That would get you something automated with existing tools but with more precision than just syndicating everything from the front page.