The pix through its various logging abilities can do this. However, to see it as more than just raw data you need a syslog server that can create a report for you. Two companies that come to mind are Network Intelligence and e-Security that have products that can do this for you (one is high end and the other is almost plug and play for smaller shops). However they aren't free, but then again I don't think there are any products that will have reports that are free. Syslog yes, but not reporting.
Hope it helps.
Steve
