Can you give more details? What is the announcement function, I didn't know about that?
Also, what's not working with Sticky? If you set a post to sticky at Publish -> Visibility -> Stick this post to the front page, then it should "stick" on top of the home page (and only the home page) and be highlighted like this post here on top:
http://wp27.bytesforall.com/
Or does changing the sticky CSS style not work at Atahualpa Theme Options -> Post/Page Styling -> POST Container: Sticky?
Or you may have expected it to stick on more pages than just the front page?