Just an idea, but if someone could write a some sort of script that would measure statistics like this, there might be the possibility of getting some decent numbers. For instance, the statistics script could probably write data to a file that would then be retreived on a schedule by a remote server. The remote server would then group the data by site and aggregate it. By signing up your site with the remote server, you could classify it as "tech," "hobby," etc., which could provide better statistics based on audience. Obviously this would not necessarily provide rock-solid statistics, but at least it would be something to go by.