Some forums have "Sticky threads" Link
stackoverflow and superuser can also have some sticky threads equivalent or something like a two day sticky.
The concept: Suppose I roll out my new funky browser and junta goes crazy about it. You can make a thread containing all the discussions regarding it a "time limited sticky". This time can be based on the popularity, like some 1000 views = x days etc. What this will do is any user visiting the site can know of the current happenings in fields that might as well interest him/her. And as these are tie limited, they will not unnecessarily clutter the main page.
May be try it out in testing, if it works you can probably use it in the main website.
I think you guys might have thought this before. Then, why did you reject the idea? I would love to hear from you on this.