Change default XML comment snippet in Visual Studio

Here is the solution working in at least VS2010.

Save the bottom code as a file summ.snippet.
Visual Studio 2010 / Tools / Code Snippet Manager
Click import, browse to file. Save with default options.

Now goto your code window and type
summ + tab + tab

Result

/// <summary>  </summary>

with the cursor in the middle of the tag, ready to type.

Here is the contents of the summ.snippet

<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">

    <CodeSnippet Format="1.0.0">
        <Header>
                <Title>Summary - inline</Title>
                <Description>Created inline summary comment tag</Description>
                <Author>Mike Vanderkley</Author>
                <Shortcut>summ</Shortcut>
                <SnippetTypes>
                        <SnippetType>Expansion</SnippetType>
                </SnippetTypes>
        </Header>
        <Snippet>
            <Code Language="csharp">
                <![CDATA[/// <summary> $end$ </summary>]]>
            </Code>
    </Snippet>
  </CodeSnippet>

</CodeSnippets>

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