I really liked the idea of this hack, but 4 queries per page, ereg's instead of preg's, and massive switch statements... these do not add up to my idea of fun.
I'm afraid that I'm going to uninstall and wait (or maybe develop) a version that has a lighter counter (1 query), and with hourly generation of stats via cron rather than an almost permanently live thing.
This has just been too intensive for me. I have a good server, but we're running several boards and the difference was notable when I commented it out in headinclude. I wouldn't recommend this hack for boards that top several hundred simultaneous users.
Very nice work though... shame I don't have a quieter board at times