It'd be interesting to see a service that could act as a floodgate for notifications, with scheduled release times when you're ready for a deluge of distractions.
What would be great IMO is for some of this to happen a little bit more automatically with the option for me to give the system feedback as to how well it did with it's filtering attempts. This would allow me to, over time, state my intentions (e.g. I really only want to be bothered with REAL problems) rather than implement the mechanisms to do so. I often feel I work for the machine - not the other way round.