The data files can also be perused in batch mode with custom shell and Perl scripts.
One use is to match up the flows with known malware signatures.
You can use this data to alert customers to problems within their networks. For example, if you flag 300 Slammer scans from a customer network, you can contact them with the source IP and UTC timestamp of the scan. They can then take action to clean the reported hosts. If you're reporting infected hosts to peers or other providers, you can run the list through the Team Cymru WHOIS server to make notification list easier to assemble.
You can use the data for statistical analysis. This is an excellent method by which you can begin to quantify the amount of "trouble" on your network. You can even create a simple "garbage meter" based on the traffic entering your Darknets.