SharePoint Web.config Debug Settings

I always seem to forget the exact changes needed in your web.config to get some REAL error information in your browser when debugging SharePoint (other than setting customErrors = false). 

<configuration>

    <SharePoint>

        <SafeMode CallStack="true" />

    </SharePoint> 

    <system.web>

        <customErrors mode="Off" />

        <compilation debug="true" />

    </system.web>

</configuration>

There’s also this posting which offers a variety of other approaches, but I’m yet to have much success with many of them (although I admittedly haven't spent much time trying).