You can use SharePoint Designer to pull information from the list directly or via web services.
There is a good walk through on Office.Microsoft for the webservice side of things:
http://office.microsoft.com/en-us/sharepoint-designer-help/add-a-soap-service-as-a-data-source-HA010355752.aspx
One good aspect of using the web services is that it doesn't matter which installation of SharePoint you have.
Hope this helps
Stephen
EDIT
I just realised if you want to do a summery of the data on the list why not just create a view on the list with all the calculations you need then add that to the web part page?
Stephen