For those who would like to aggregate the RSS feeds from multiple lists/document libraries in SharePoint, I developed the SharePoint 2010 RSS Feeds Aggregator. The aggregator is just a ASPX page which generates aggregated RSS feeds depending on the parameters passed in URL. You can also configure the title, link and description of the final RSS feed xml. The URL can be then used in the standard SharePoint RSS viewer webpart or together with any third-party RSS webpart.
After installation of the SharePoint solution, simply go to the following page:
This page contains instructions and the sample settings.
If you encounter "The RSS webpart does not support authenticated feeds" error while configuring the RSS viewer werbpart, you need to change the authentication provider settings from NTLM to Kerberos:
- Go to SharePoint 2010 Central Administration and click on the Manage web Application
- Select your web application and click on the Authentication Providers
- Click on the zone and under the IIS Authentication Settings select Negotiate (Kerberos)
Apart from this you don't need to configure anything else.
You can download the solution from here.