This is probably a question that others have asked and had answered, but my search of the forums has not found it.  I have a site that I have upgraded to .net 3.5 using the DotNetNuke Host setting option.  I had DNN 5.0.1 on the site and now want to upgrade to 5.1.1 (the newest stable release).  When I look at the diffs between the release.config file that comes inside the upgrade zip file as compared to my current web.config file, there are a couple of diffs that I was not expecting.  For example, in my current web.config file, in the system.webServer handlers section, there are no lines that begin with

<add name="AJAX_...

but there are 3 such lines in the release.config file.  And, I do have several lines that don't exist in the release.config, notably a few that start

<remove name="...

as well as 3 that start with

<add name="Script..

There are also differences in the comiplation node where these lines:

        <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
 

which seem to appear instead of

        <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
 

Seems to me that I remember seeing a site somewhere that the critical differences of the release.config file between DNN versions was tracked for reference, along with a simple explanation of what the differences impact.

Thanks in advance for your time in responding to this post!