Here’s a handy new plugin for all of the WordPress network administrators out there. The Multisite Dashboard Feed Widget displays the most recent posts from the main site in the dashboard of each site within your network. Check it out:
By default the widget displays the titles (and links to) the three latest posts of the Main Site in your network (blog_id=1).
This widget provides a simple way to keep all of your sites up to date on the main blog’s news. The Multisite Dashboard Feed Widget is available for free from the WordPress repository.

Is there a way to get it to pull some content, like the WordPress blog widget?
@John, yes, you can change the rss feed if you wish to do so. For more infoyou can either look at the plugin page on WordPress (linked above) or on the plugin page itself: http://wpti.ps/?p=103