Currently Sticky Posts are sticky once and when you view it, they act like a normal post.
That's fine if you're a member the whole time and frequently log in.
If you don't log in though, or haven't logged in for awhile every single new sticky post will be displayed.
That's ok if it's still relevant but if it's not it sits there cluttering up new users. In this site, it looks like many discussions have been manually "de-stickied".
So two ideas
Expiring Sticky
Revolving Sticky
Expiring Sticky will expire on a timer. 1 day, 1 month, etc it will automatically remove the sticky tag
Revolving Sticky will expire when n number of new stickies are created. Eg, if you create 3 new ones, the current one automatically becomes unsticky.
Of course, making both the options optional and the option to make something default would be nice too.