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I found myself constantly looking up common elements for the web.config file. I decided to create a web.config reference so I can quickly lookup xml tag element formats when developing ASP.NET applications. This is a work-in progress so be sure to check back. If you have any suggestions please send me an email and I'll try and modify this template.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.web>
<!--  DYNAMIC DEBUG COMPILATION
Set compilation debug="true" to enable ASPX debugging.  Otherwise, setting this value to
false will improve runtime performance of this application. 
Set compilation debug="true" to insert debugging symbols (.pdb information)
into the compiled page. Because this creates a larger file that executes
more slowly, you should set this value to true only when debugging and to
false at all other times. For more information, refer to the documentation about
debugging ASP.NET files.
-->
<compilation defaultLanguage="c#" debug="true" />
<!--  CUSTOM ERROR MESSAGES
Set customErrors mode="On" or "RemoteOnly" to enable custom error messages, "Off" to disable. 
Add <error> tags for each of the errors you want to handle.
"On" Always display custom (friendly) messages.
"Off" Always display detailed ASP.NET error information.
"RemoteOnly" Display custom (friendly) messages only to users not running 
on the local Web server. This setting is recommended for security purposes, so 
that you do not display application detail information to remote clients.
-->
<customErrors mode="RemoteOnly" />
<!--  AUTHENTICATION 
This section sets the authentication policies of the application. Possible modes are "Windows", 
"Forms", "Passport" and "None"
"None" No authentication is performed. 
"Windows" IIS performs authentication (Basic, Digest, or Integrated Windows) according to 
its settings for the application. Anonymous access must be disabled in IIS. 
"Forms" You provide a custom form (Web page) for users to enter their credentials, and then 
you authenticate them in your application. A user credential token is stored in a cookie.
"Passport" Authentication is performed via a centralized authentication service provided
by Microsoft that offers a single logon and core profile services for member sites.
-->
<authentication mode="Windows" />
<!--  AUTHORIZATION 
This section sets the authorization policies of the application. You can allow or deny access
to application resources by user or role. Wildcards: "*" mean everyone, "?" means anonymous 
(unauthenticated) users.
-->
<authorization>
<allow users="*" /> <!-- Allow all users -->
<!--  <allow     users="[comma separated list of users]"
roles="[comma separated list of roles]"/>
<deny      users="[comma separated list of users]"
roles="[comma separated list of roles]"/>
-->
</authorization>
<!--  APPLICATION-LEVEL TRACE LOGGING
Application-level tracing enables trace log output for every page within an application. 
Set trace enabled="true" to enable application trace logging.  If pageOutput="true", the
trace information will be displayed at the bottom of each page.  Otherwise, you can view the 
application trace log by browsing the "trace.axd" page from your web application
root. 
-->
<trace enabled="false" requestLimit="10" pageOutput="false" traceMode="SortByTime" localOnly="true" />
<!--  SESSION STATE SETTINGS
By default ASP.NET uses cookies to identify which requests belong to a particular session. 
If cookies are not available, a session can be tracked by adding a session identifier to the URL. 
To disable cookies, set sessionState cookieless="true".
-->
<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424" 
            sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
cookieless="false" timeout="20" />
<!--  GLOBALIZATION
This section sets the globalization settings of the application. 
-->
<globalization requestEncoding="utf-8" responseEncoding="utf-8" />
<!-- Disabling request validation for your application
To disable request validation for your application, you must modify or create a Web.config file 
for your application and set the validateRequest attribute of the <PAGES /> section to false: 
Reference: http://www.asp.net/faq/RequestValidation.aspx
  <pages validateRequest="false" /> 
-->
<!-- HttpModule 
HttpModule Element:       
<httpModules>
<add type="classname,assemblyname" name="modulename"/>
<remove name="modulename"/>
<clear/>
</httpModules>
   Example:
<httpModules>
<add type="Demos.Components.CSharpFriendsHttpModule,Demos" name="CSharpFriendsHttpModule" />
</httpModules>
-->
<!-- HttpHander
HttpHandler Element:
<httpHandlers>
<add verb="verb list" 
path="path/wildcard" 
type="type,assemblyname" 
validate="true|false"/>
<remove verb="verb list" 
path="path/wildcard"/>
<clear/>
</httpHandlers>
   Example:
<httpHandlers>
<add verb="*" path="Salman/*.aspx" type="Demos.Components.MyHttpHandler,Demos" />
</httpHandlers>
-->
</system.web>
</configuration>