In SharePoint 2007, there was a useful tool underneath Site Collection Administration called “Storage space allocation” that led to storman.aspx underneath http://servername/_layouts/storman.aspx.
This storman tool allowed you to view how your space was being used within your site collection, and if you were filling up your site against your storage quota, you could show documents, document libraries, lists, and recycle bins, sorted by size or date. This was a great way to find large or old documents to delete and free up space.
Unfortunately, this tool is not available with SharePoint 2010. How can a site collection administrator that is approaching their storage quota find out what is using up their space (whether larger or old content is the culprit)?