I'm not sure if this is even possible, but here goes:
I would like to have in the sidebar, have 1 post, the most current post from a single category. For example, I want to create an Announcement in the sidebar, and any time a post is made to the Announcement category, that post will show up and replace the previous Announcement post in the sidebar. I have an idea it would using the call up specific category code, but I'm not sure how to make it display only 1 post. Thanks for any and all help!