URL Rewriter and google?

I use a URL rewriter to get more visitors on my website, it should be better for google and some other search enginges.
So i'm using http://urlrewriter.net/ .

In my web.config file i used some links like this:
<rewriter>
    <rewrite url="~/webshop/(.+)/producten/(.+).aspx" to="~/products.aspx?productID=$1&amp;r=1"></rewrite>
    <rewrite url="~/webshop/(.+)/producten/(.+)/(.+).aspx" to="~/products.aspx?productID=$1&amp;r=1"></rewrite>
But every page has a rewrite, so i'm using the website for a week right now, and there is only 1 page available if i search in google on: site:sitename.com
For another website, there is no page available, also after i added it with the webmaster tools of google?
So whats wrong? doesnt work the urlrewriter? ????
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