A better traffic accounting system. For example bandwidthD does not give any options to look at certain times, or to go back 3 days to check an IPs usage on that day.
eg. I would like to be able to check down to the hour over any IP over all the logs. Possibly use drop down boxes to pick if you want to check its total usage since logs started, or monthly, weekly, daily, hourly. And have drop down boxes that react to these options to give you a way to input which month/week/day/hour/IP you want to check.