Since Stack Overflow is becoming popular and favorite for Enthusiastic Programmers and chat rooms on Stack Overflow are really very helpful to discuss technical stuffs.
If we have chat application developed for iOS and Android it will be a good step towards making the community better. Since many of the members would like to stay online while they are travelling or away from their computers will be able to communicate if chat application is available for mobiles.
This is just a suggestion of mine to make our Community more fruitful.