URL rewriting. So, so close!!

My quest for extensionless URLs continues.
I have got this almost working using the IIS7 rewrite module.
I have now got my URL looking like:

http://www.mysite.com/art/12/lovely_picture

but it seems I have also rewritten something I shouldn't have because I now can't login ;)

Help anyone?...

here is my system.webserver section
<rewrite>
      <rules>
        <rule name="Default Redirect" stopProcessing="true">
          <match url="^default\.aspx$" />
          <action type="Redirect" url="/" redirectType="Permanent" />
        </rule>
        <!--<rule name="Redirect aspx to extensionless" stopProcessing="true">
          <match url="(.*)\.aspx" />
          <action type="Redirect" url="{R:1}" redirectType="Permanent" />
        </rule>
        <rule name="redirect default extensionless document" stopProcessing="true">
          <match url="(.*)default" />
          <action type="Redirect" url="{R:1}" redirectType="Permanent" />
        </rule>
        <rule name="rewrtie the aspx extension">
          <match url="(.*)" />
          <conditions logicalGrouping="MatchAll">
            <add input="{URL}" negate="true" pattern="\.axd$" />
            <add input="{URL}" negate="true" pattern="\.js$" />
            <add input="{URL}" negate="true" pattern="\.ashx$" />
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
          </conditions>
          <action type="Rewrite" url="{R:1}.aspx" redirectType="Permanent"/>
        </rule>-->
      </rules>
    </rewrite>

my urlrewritingnet config:
{0}art/{1}/{2}
{0}craft/{1}/{2}

    <add name="ProductDetailsRewrite" virtualUrl="^~/art/([0-9]*)/([\w-]*)"
         rewriteUrlParameter="ExcludeFromClientQueryString"
         destinationUrl="~/Product.aspx?ProductID=$1&amp;$3"
         ignoreCase="true"  />
    <add name="CategoryDetailsRewrite" virtualUrl="^~/craft/([0-9]*)/([\w-]*)"
         rewriteUrlParameter="ExcludeFromClientQueryString"
         destinationUrl="~/Category.aspx?CategoryID=$1&amp;$3"
         ignoreCase="true" />

Sorted!!

What I did was, I got a thousand monkeys and a thousand typwriters and eventually they came up with this!

 <system.webServer>
    <rewrite>
      <rules>
        <rule name="Default Redirect" stopProcessing="true">
          <match url="^default\.aspx$" />
          <action type="Redirect" url="/" redirectType="Permanent" />
        </rule>
        <rule name="RedirectUserFriendlyURL1" stopProcessing="true">
          <match url="^([a-z-]+)/([_0-9]+)/([0-9a-z-]+)\.aspx$" />
          <conditions>
            <add input="{REQUEST_METHOD}" negate="true" pattern="^POST$" />
          </conditions>
          <action type="Redirect" url="{R:1}/{R:2}/{R:3}" appendQueryString="false" redirectType="Permanent" />
        </rule>
        <rule name="RewriteUserFriendlyURL1" stopProcessing="true">
          <match url="^([a-z-]+)/([_0-9]+)/([0-9a-z-/.]+)$" />
          <conditions>
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
          </conditions>
          <action type="Rewrite" url="{R:1}/{R:2}/{R:3}.aspx" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>

The old methods are the best. ;)