Having the right information is essential to track down development issues. Arecibo gives you the information you need to track down the real problem, not just a 404 code. You don't have to rely on a user's vague email to pinpoint the error's cause.
You can see:
It doesn't matter if you're using Django, Python, Ruby on Rails, Google App Engine, Plone, PHP or Javascript. By just adding a few lines of code, you'll get full, consolidated error reports.
Automatically gather errors from different modules, frameworks, and servers then view them on the web, email, twitter or RSS.