Tweeting on-hold Wait Times?

So I have had the idea that I think would be a great service to allow people to tweet when they are being asked to wait on hold on the telephone, or at the doctor or dentist office. Something like #onhold or #waiting and then the company that you are waiting #onhold ATT or #onhold Frontier or #waiting Walmart.  It would be important to really think about how to handle the formatting of the tags and support information. I realize you could just start doing it on twitter and see it would take off, but it might be interesting to build a site designed to aggregate the data and provide the Zeitgeist in a human readable way.    If you could add an estimated time, that would be great as well.

I haven't thought it through, but it seems the service would be valuable to consumers if linked to Yelp or other consumer services and it could provide insight into customer service for many companies.  It might also be more of a mobile app, but I think there wouldn't be strong adoption if people had to download an app.

Is there anything out there already?  I haven't looked.

One positive angle would be to allow people to log something productive or positive they were able to do while waiting.

#waiting dentist 10min brainstormed new twitter service

UPDATE: Bob Coffield twitter stream reveals something along these lines in healthcare...

@iHealthBeat new web-based tool called @MedWaitTime
 to check wait times at hospitals and doctor's office: http://bit.ly/9r56Lo#health20