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You could use an iframe to insert the content or an include. IMHO those two options would be the easiest without knowing more about how your posts are generated.
There is another option and that is an RSS feed, but I would suggest that in addition to anything else.
And where and with what the posts are done, and also whether and where archived posts will reside on the site. That all takes a dynamic solution, which Dreamweaver doesn't do. That needs some sort of server side technology, one way or another (which isn't DW).
It might be worth checking into magazine style Wordpress (or other CMS) themes that are customizable, and do accomplish that - including embedding news feeds, videos, galleries and ads. Then DW could just be used for regular static pages and incorporated into the navigation.
[edited by: Marcia at 5:07 am (utc) on Aug. 31, 2008]
For a shortcut solution, create the post, navigate to it, and copy the location in the address bar. Edit your main page to include the link. This is a manual method and would be a pain, especially if you have other contributors and always want the latest post to display.