dcrombie - 4:11 am on Aug 3, 2004 (gmt 0)

I would look at the weekly totals for the top browsers (probably MSIE 6.0, 5.5 and 5.0) and the top robots (Googlebot, Ask Jeeves, msnbot, Slurp). If the ratio of robots to browsers stays fairly constant then you can apply that percentage to your total hits.