Found this handy post outlining the the correct format for creating a URL to render a SSRS report hosted in SharePoint integrated mode.
http://blogs.msdn.com/b/prash/archive/2009/01/21/passing-url-report-parameters-to-reports-in-sharepoint-document-library-in-ssrs-2008.aspx
Very handy for creating Go To URL Actions, speaking of which if you want to open your report in a new window check out the post below.
http://www.bidn.com/blogs/BrianKnight/ssis/972/ssrs-action-to-open-a-url-in-a-new-window
So it turns out that refreshing all reports on a dashboard may not provide you with the desired user experience; Content Editor to the rescue.
Add a Content Editor Control web part to your Web Page
First find the ID of the Refresh Button on on the SSRS webpart tool bar of the report to be refreshed; I used IE Developer tools to find the ID.
Once you have the ID, add the following script to the content Editor control and every 60 seconds the report gets refreshed.
<script type=”text/javascript”>
function refreshReport()
{
var btn = document.getElementById(“ID Goes Here“);
btn.click();
}
setInterval(‘refreshReport()’ ,60000);
</script>
