More Accurate Bandwidth Information?

I’d like to have bandwidth information that is more accurate than what or the webpanel will provide. Ideally, I’d like to be able to see my daily bandwidth when I ask for it.

Maybe a system whereby a user could analyze their bandwidth once per day (with credits building up) when they press a button on the /stats/ page? That way nobody would be using huge amount of CPU time, but people could get more time accurate information.