I think we will definately see more of them around the web as more people start using asp.net. It is super simple to fix, but there are reasons why maybe you want to show them still. For me, I can't debug on my hosting server. So therefor I need errors to show. I am implementing the error logging code from msdn which should help out some, but for testing purposes and catching all the bugs, I need the errors to show.

But, at least I do know how to turn them off and provide a custom error page when I need to do it. When I feel that I have caught 99% of the bugs, then I will turn on the custom error pages and not show those anymore.