Congratulations, Duncan. You've won. Now I just have to decide what your prize is.... Duncan sent me a screenshot of my site with the counter at 300,001 at 06:19. Just goes to show: the early bird gets the worm. Yes, Duncan, that's what you've won - a worm. In fact, a whole bunch of worms - Earworms, a CD of the songs currently residing deep within the furthest recesses my head.
I shall also send a prize to Alan, who spotted the counter at 300,004 yesterday when it went haywire.