I'm also noticing differences between what any users QCN stats page says at the top as "total credit" and the score below it:

Example: http://qcn.stanford.edu/sensor/show_...p?userid=19842
Total Credit : 54,209
Quake Catcher Network: 53,147

And yes the stats folder seems to be MIA last update seems to be just before an outage that happened around Christmas...