I hope this hasn't been addressed already (I did search).
I would really like a monthly report. I think this is very valuable with ISP's imposing monthly bandwidth limits on many of us now. It would also be nice to have to ability to generate reports of whatever time frame a user wants. Personnally, I'd like to have the monthly reports added, but I could see where business customers might want semi-annual and annual reports as well.
What do you think?