Mod to group stickies together on discussion topic pages (by AaronWebstey).
I've modified my version of this plugin so that you can choose to 'Group all forum-level Stickies together on Discussion Topic Pages'. This plugin kicks ass, but looked a bit weird for me since each of my 2 or 3 announcements had their own date label. Use at your own risk; it's only been tested a bit by myself and I think @peregrine is about done with my incessant ranting about this plugin.
Excuse the blanked-out titles, as well as the 'stickies' instead of 'announcements' text. It will show up as 'announcements' for you if you have not messed with locale.php like I have.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.