Hagrin.com

Anyone who has worked with SharePoint extensively knows that when troubleshooting SharePoint errors you will be confornted with some of the most meaningless, generic error messages of any major application around. However, thanks to articles like this (which is where I first read this tip), SharePoint developers and administrators can turn on more descriptive, "friendly" error messages by making two changes to your web applications web.config file -

1. Set customErrors=off
2. Set CallStack="true"

Making these two changes in your development environment will really help your SharePoint developers and admins troubleshoot technical issues.