Today, a tournament started. The only way I really noticed it is a CM mentioning a stream amongst the general spam of Global; when I went to look for the link a few minutes later, I couldn't find it.
An Announcement Banner or News Feed would solve this issue (as well as make important topics known to players that have chat turned off)! I remember reading about a newspaper/tv/thing for leaderboards, and that's fantastic, but for events that are more instantaeous, an instant news feed would be useful.
So, in the above example, if I missed the chat link I could just wait for the news feed to show it or, better yet, open up a 'News' tab and find it there!
It could be just for server announcements (We're shutting down the servers in X hours, please log out...) or, you could work it into something else (Professors everywhere are noticing a swarm of Mewtwo at Route 1! Trainers are needed to thin out the swarm.)
I feel this would incorporate many of the ideas already suggested by other players quite well. It's a malleable tool of information!
This wouldn't replace the newspaper idea, as I wouldn't want leaderboard/pvp/etc stats on the message feed (unless it was like 'Player Dumuzid defeated Danii in the Fight-a-CM Tournament Finals! Congratulations!' type messages)
Finally, a neat toggle for the news feed/radio/whatever you want to call it would be welcomed, as I'm sure there are players that don't want scrolling words across their screen all the time.