For some time now I’ve been putting about the idea in my company that we should have a smarter way of managing application exceptions. But the idea has never floated to the top of the pile.
Now there are two sites (maybe more) offering this as a feature. They both appear to collate stats on exceptions from your rails application, so that you can easily spot the difference between exceptions that bug your users every hour of the day, the ones that happen once in a blue moon, the ones that occur right after code deployment, etc.
Look forward to playing with them.