Sorry for the delay replying. As you've probably noticed, the Noticeboard and Weblog applications are the same, but are configured slightly differently. In particular, in the noticeboard we don't have draft entries.
(we imagined that noticeboard would be used for several members to share posts, but that weblog would be used by the admins as a more traditional blogging tool)
I expect this eplains the difference.
Note that I as a sitewide admin can reconfigure any chosen instance of weblog/noticeboard to allow draft posts. I could update the hotopportunities one if you like?