Stopped requests are a real concern because of the way download accelerators like Go!Zilla, FlashGet, and GetRight often work. The more uncouth ones will request a file multiple times at the same time at different Range offsets and then drop connections once they get an overlap - so make sure the %O in mod_logio really works. What a great Apache module! I wish had been available back in 1999-2000, when I was doing this sort of thing. Actually, I was doing the reverse - trying to regulate a free geocities-type site (and prevent residents from using more than their fair share of bandwidth). I ended up counting each partial request at the full size of the file, primarily punishing the warez and pr0n crowd (who tend to use download accelerators the most), which was fine with me.