using one content list for multiple sites

Has anyone ever configured one content list to work with multiple sites? Basically I have several sites that are all using the same templates, content types, etc and I would like to use the same content list for these sites. When I tried inputting multiple site IDs and changed the query to look into both sites, it didn’t seem to work for me. Did a conference call with percussion tech support and they didn’t seem to think it would work either, but thought I would post a message to see if anyone has tried and made it work.