The SharePoint 2010 out of the box "What’s new" webpart is a nice feature unless the fact that it’s working only on the site level. So if you need something for a Site collection or cross site you need to look out for another solution. So here is my little workaround:
- Go to this website http://firearrowsoft.com/product_rss.php
- Install the free rss viewer Webpart on your sharepoint server.
- Activate RSS feed on your Sitecollection
- add the RSS WebPart to your sitecollection
- Configure the webpart by adding all important Libraries and Lists through there RSS-Feeds
Maybe it’s not the best solution but I think it’s a small, working and quick one
