Veritas StorageCentral is one such product that provides quota management and reporting. You can learn more about it at http://www.veritas.com/Products/www?c=product&refId=48. A more modest solution is Advexsoft Disk Space Inspector, which you can learn about at http://www.advexsoft.com/faq/why_dsi.html.
Related Q&A from Jerry Honeycutt
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