Tonight, at 8:36 pm, a visitor on the East Coast, linking to me from Daily Pundit was my 20000th visitor.
Unlike some sites, I have been careful to exclude myself from the counter (Sitemeter has an "Ignore IP Address" feature which I use religiously), and the actual number of visitors is somewhat higher (one of the IP addresses I block is the one at work, which means that none of my coworkers hits get counted, either. However, I will stick with the documented hits, so the comcast user who visited me is the milestone.