I recently ran in to a blog article which referenced an online application called HopToad (http://www.hoptoadapp.com).
HopToad is an online application that plugs directly into your Rails application and collects all errors that are thrown in your app in a neat and readable UI. I have about 15 Rails applications out there right now, and HopToad is a life-saver for me.
The best thing is, it’s free. Go to http://www.hoptoadapp.com to try it out.