Please add the functionality to dismiss or kill the site-wide announcement bars. Not the standard notification bars that come with phrases such as:
You've earned "Iconoclast" and 1 other badges. See your profile.
But the banner that runs on occasion like during an election for moderators or anniversary notices (as in the case of Super User) and things with chat or site downtime.
After X number of days, hours or minutes they just become visual noise.
Server Fault meta has further discussions on this in the adventures of Is the dark blue system notification bar annoying?
Suggestions have been made on how to make the system message bar friendlier while still achieving the desired results.